CS 163/164 - Exam 1 Study Guide and Practice Exam

Transcription

1 CS 163/164 - Exam 1 Study Guide and Practice Exam September 11, 2017 Summary 1 Disclaimer 2 Variables 2.1 Primitive Types Strings Suggestions, Warnings, and Resources FAQs Printing 3.1 Suggestions, Warnings, and Resources FAQs Conditional Statements 4.1 if-else if-else Statements Difference between if-if-if and if-else if-else Switch Statements Suggestions, Warnings, and Resources Other Classes 5.1 Integer Double Character Math Scanners 6.1 Suggestions, Warnings, and Resources FAQs Practice Written Exam 7.1 Short Answer Tracing Code Programming Quiz Practice Exam 9 Suggestions for Studying and Test Taking 9.1 Written Programming Quiz Common Errors Challenges

2 10 Answers to Practice Written and Programming Problems 10.1 Written Short Answer Tracing Programming

3 1 Disclaimer This is a review of the material so far, but there may be material on the exam not covered in this study guide. 2 Variables 2.1 Primitive Types The eight primitive types are: int, double, char, float, long, short, byte, and boolean. So far you ve learned about two reference types, a String and a Scanner. These are NOT a primitive types, you will learn why later in the semester. Below are a few examples of declaring a variable. Format: type var name;. 1 i n t i ; 2 double d ; 3 char c ; 4 S t r i n g s ; Below are a few examples of assigning a variable. Format: var name = value;. 1 i = 3 ; 2 d = 4. 5 ; 3 c = a ; 4 s = Hey a l l! ; Below are a few examples of initializing a variable. Initializing is a combination of declaring and assigning. Format: type var name = value; 1 boolean b = t r u e ; 2 f l o a t f = F ; 3 long l = 32L ; 4 S t r i n g r e s p o n s e = Yes ; Remember: Every variable must always have a declaration (assignment can come later). Below are a few examples of typecasting. 1 i n t i = 3 ; 2 double d = ( double ) i ; 3 char c = c ; 4 i n t a s c i i c = ( i n t ) c ; Remember: If you typecast you can lose information, for example if I typecast 6.8 to an integer I will get back Strings Common String methods: length (ex. s.length();) charat (ex. s.charat(0);) indexof (ex. s.indexof( a );) substring (ex. s.substring(0, 3);) equals (ex. s.equals(s1);) touppercase (ex. s.touppercase();) tolowercase (ex. s.tolowercase();) Below are a few examples of how to use the above methods.

4 1 p u b l i c c l a s s Review { 2 p u b l i c s t a t i c void main ( S t r i n g [ ] a r g s ) } 3 // D e c l a r a t i o n 4 S t r i n g s ; 5 6 // A s s i g n i n g 7 s = Hi t h e r e ; 8 9 // D e c l a r i n g & A s s i g n i n g 10 S t r i n g mystring = Okay then ; 11 S t r i n g mystring1 = new S t r i n g ( Okay f i n e then ) ; //Common Methods 14 S t r i n g s = SmIlEy monkey ; 15 char c0 = s. charat ( 0 ) ; // a s s i g n s S to v a r i a b l e c 16 i n t i 0 = s. indexof ( z ) ; // a s s i g n s 1 to v a r i a b l e i 0 17 // because t h e r e i s no z i n s 18 // stringname. s u b s t r i n g ( i n c l u s i v e index, e x c l u s i v e index ) 19 S t r i n g sub = s. s u b s t r i n g ( 0 ) ; // a s s i g n s s to sub 20 // r e t u r n s 21 // ( stringname. s u b s t r i n g (#) 22 // the c h a r a c t e r from # 23 // to the end o f the s t r i n g S t r i n g s1 = s. s u b s t r i n g ( 0, 1 ) ; // only r e t u r n s S because s u b s t r i n g t a k e s an 26 // i n c l u s i v e index as the f i r s t parameter and 27 // an e x c l u s i v e index f o r the second. 28 // Meaning, t h i s would only read the f i r s t l e t t e r. 29 System. out. p r i n t l n ( s. touppercase ( ) ) ; // does not change s! 30 S t r i n g newstring = s. tolowercase ( ) ; // does not change s! 31 System. out. p r i n t l n ( s. e q u a l s ( newstring ) ) ; // p r i n t s f a l s e 32 boolean b = s. e q u a l s ( sub ) ; // a s s i g n s t r u e to b 33 i n t l e n g t h = sub. l e n g t h ( ) ; // a s s i g n s 13 to l e n g t h 34 //( 1 based not 0 based 35 //( l i k e i n d e x e s ) 36 } 37 } 2.3 Suggestions, Warnings, and Resources Warning: Make sure you use the correct ticks/quotes for variables. For example, to assign/initialize a char you must use (ticks or single quotes), to assign/initialize a String you must use (double quotes), and numbers don t use ticks or quotes. Warning: Always use String s.equals method (compared to ==). Warning: Indexing for Strings always starts at 0 (for example the first character is the same as the 0th character). Warning: String methods do NOT change the original string! Resource: Use Oracle s documentation for more methods and examples Resource: Oracle s Learning Paths 2.4 FAQs 1. Q: Why is there an F or L at the end of a long or float value? Is it case sensitive? A: If you leave off the F when assigning or initializing a float, Java will assume you want a double (instead of a float). A float can hold 32-bit number and a double can hold a 64-bit number. You only need to add an L when assigning/initializing a long when the value won t fit into an int. An int can hold numbers between 2 31 and and a long can hold numbers between 2 63 and The F and the L are not case sensitive, but be careful a lower case l looks an awful like the number 1.

5 3 Printing There are three ways to print to the console: System.out.print();, System.out.println();, and System.out.printf();. Below are examples of how and when you could use each. 1 i n t num1 = 3 ; 2 i n t num2 = 5 ; 3 i n t num3 = 9 ; 4 double avg = (num1 + num2 + num3) / 3 ; 5 6 // The f o l l o w i n g t h r e e p r i n t statements are e q u i v a l e n t 7 System. out. p r i n t ( Average + num1 +, + num2 +, and + num3 + : + avg + \n ) ; 8 System. out. p r i n t l n ( Average + num1 +, + num2 +, and + num3 + : + avg ) ; 9 System. out. p r i n t f ( Average %d, %d, and %d : %.1 f \n, num1, num2, num3, avg ) ; i n t i = 2 ; 12 double p = ; 13 System. out. p r i n t f ( %d\n, i ) ; 14 System. out. p r i n t f ( %04d\n, i ) ; // p r i n t s 2 with 3 z e r o s b e f o r e i t 15 System. out. p r i n t f ( % f \n, p ) ; // p r i n t s with 6 d i g i t p r e c i s i o n and rounds 16 System. out. p r i n t f ( %.3 f \n, p ) ; // p r i n t s with 3 d i g i t p r e c i s i o n and rounds This outputs the following: Average 3, 5, and 9: 5.0 Average 3, 5, and 9: 5.0 Average 3, 5, and 9: System.out.print(); is the same as System.out.println(); except it doesn t have a new line character at the end of the line. System.out.printf(); uses format specifiers as placeholders. A format specifier begins with a percent sign and ends with a converter. %d - int %f - float %.#f - (# is the number of decimal places) float %c - char %s - String 3.1 Suggestions, Warnings, and Resources Resource: Here is a good printf resource. Resource: Oracle s Formatter Documentation Note: If you don t specify how many decimals to print when using printf, Java defaults to printing six decimal digits. Warning: Printf rounds! 3.2 FAQs 1. Q: Can you use any of the three ways to print? Is there a specific time you d use one over the other? A: You can any of the three ways to print at any time, one might be easier in some situations (i.e. if you have a lot of variables to print, printf might be easier). 2. Q: Is it necessary to use printf or String.format if you need to specify decimal places? A: Yes.

6 4 Conditional Statements 4.1 if-else if-else Statements 1 p u b l i c c l a s s C o n d i t i o n a l s { 2 p u b l i c s t a t i c void main ( S t r i n g [ ] a r g s ) { 3 i n t i = 0 ; 4 // i f statement 5 i f ( i == 0) { 6 System. out. p r i n t l n ( i == 0 ) ; 7 } 8 boolean b = t r u e ; 9 // I don t need b r a c k e t s because I only have one l i n e o f code 10 // under each statement. However, you can always have b r a c k e t s 11 // l i k e the example above. 12 i f ( b == f a l s e ) 13 System. out. p r i n t l n ( b i s FALSE ) ; 14 e l s e 15 System. out. p r i n t l n ( b i s TRUE ) ; i n t i 1 = 3 2 ; 18 // here I do need b r a c k e t s because t h e r e i s more than one 19 // l i n e o f code nested i n my i f statement. 20 i f ( i 1 >= 15) { 21 System. out. p r i n t l n ( i 1 i s g r e a t e r than or equal to 15 ) ; 22 i 1 ++; 23 } 24 e l s e i f ( i < 3) 25 System. out. p r i n t l n ( i i s l e s s than 3 ) ; 26 // e l s e s are l i k e catch a l l s t h e r e are a s e c t i o n o f numbers 27 // that aren t covered by my i f and e l s e i f so my e l s e w i l l 28 // handle t h o s e v a l u e s 29 e l s e 30 System. out. p r i n t l n ( i must be between 3 and 14 ) ; // sometimes you don t need an e l s e 33 S t r i n g name = Waldo ; 34 // i f I have found Waldo I want to say I found him but i f ( name. e q u a l s ( Waldo ) ) 36 System. out. p r i n t l n ( Found him! ) ; 37 // i f I didn t f i n d him I don t want to do anything 38 } 39 } The output from the above code is: i == 0 b is TRUE i1 is greater than or equal to 15 Found him! 4.2 Difference between if-if-if and if-else if-else If you use an if-else if-else statement and multiple conditionals are true, the program executes the first true conditional and then exits. If you use an if-if-if statement and multiple conditionals are true, the program will execute all of the true conditionals. 1 p u b l i c c l a s s C o n d i t i o n a l s { 2 p u b l i c s t a t i c void main ( S t r i n g [ ] a r g s ) { 3 i n t i = ; 4 System. out. p r i n t l n ( i f e l s e i f e l s e statement ) ; 5 i f ( i == 128) 6 System. out. p r i n t l n ( i == 128 ) ; 7 e l s e i f ( i > 100) 8 System. out. p r i n t l n ( i > 100 ) ;

7 9 e l s e i f ( i < 130) 10 System. out. p r i n t l n ( i < 130 ) ; System. out. p r i n t l n ( i f i f i f statement ) ; i f ( i == 128) 15 System. out. p r i n t l n ( i == 128 ) ; 16 i f ( i > 100) 17 System. out. p r i n t l n ( i > 100 ) ; 18 i f ( i < 130) 19 System. out. p r i n t l n ( I < 130 ) ; 20 } 21 } The output from the above code is: if-else if-else statement i == 128 if-if-if statement i == 128 i > 100 I < Switch Statements 1 p u b l i c c l a s s C o n d i t i o n a l s { 2 p u b l i c s t a t i c void main ( S t r i n g [ ] a r g s ) { 3 i n t i = 3 2 ; 4 switch ( i ) { 5 c a s e 1 0 : System. out. p r i n t l n ( i = 10 ) ; break ; 6 c a s e 3 2 : System. out. p r i n t l n ( i = 32 ) ; break ; 7 c a s e : System. out. p r i n t l n ( i = 101 ) ; break ; 8 d e f a u l t : System. out. p r i n t l n ( i i s not 10, 32, or 101 ) ; 9 } // beware o f your breaks! 12 char c = b ; 13 switch ( c ) { 14 c a s e a : System. out. p r i n t l n ( c = a ) ; 15 c a s e b : System. out. p r i n t l n ( c = b ) ; 16 c a s e c : System. out. p r i n t l n ( c = c ) ; 17 d e f a u l t : System. out. p r i n t l n ( c i s not a, b, or c ) ; 18 } // times you might want to not have breaks 21 i n t dogs = 0, c a t s = 0 ; 22 S t r i n g breed = German Shepard ; // s p a c i n g doesn t matter 25 // you aren t r e q u i r e d to have a d e f a u l t 26 // l i k e you aren t r e q u i r e d to have an e l s e 27 // j u s t be aware that t h e r e are p o s s i b l e c a s e s 28 // that aren t being handled. 29 switch ( breed ) { 30 c a s e Boxer : 31 c a s e Great Dane : 32 c a s e German Shepard : 33 c a s e Lab : 34 dogs++; break ; c a s e C a l i c o : c a s e B r i t i s h S h o r t h a i r : c a s e Siamese : 37 c a t s ++; break ; 38 } 39 System. out. p r i n t f ( Dogs : %d, Cats %d\n, dogs, c a t s ) ; 40 } 41 }

8 The output from the above code is: i = 32 c = b c = c c is not a, b, or c Dogs: 1, Cats Suggestions, Warnings, and Resources Warning: Don t add a semicolon after your conditional. For example if (32 == 32);. Warning: Be aware of when you should and shouldn t have breaks in your switch statement. 5 Other Classes 5.1 Integer Common Integer Methods and Constants parseint (ex. Integer.parseInt("3");) MAX VALUE (constant) (ex. int max = Integer.MAX VALUE;) MIN VALUE (constant) (ex. int min = Integer.MIN VALUE;) 5.2 Double Common Double Methods and Constants parsedouble (ex. Double.parseDouble("3.3");) MAX VALUE (constant) (ex. double max = Double.MAX VALUE;; MIN VALUE (constant) (ex. double min = Double.MIN VALUE;; 5.3 Character Common Character Methods isuppercase (ex. Character.isUpperCase( a );) islowercase (ex. Character.isLowerCase( a );) isletter (ex. Character.isLetter( 4 );) isdigit (ex. Character.isDigit( 4 );) 5.4 Math Common Math Methods and Constants: sqrt (ex. Math.sqrt(64);) pow (ex. Math.pow(1.0, 3.0);) sin (ex. Math.sin(1.5);) cos (ex. Math.cos(1.5);) exp (ex. Math.exp(3.3)) log (ex. Math.log(2.1);)

9 min (ex. Math.min(1, 3);) max (ex. Math.max(1, 3);) round (ex. Math.round(3.3)) floor (ex. Math.floor(3.3);) ceil (ex. Math.ceil(3.3))) PI (constant) (ex. double num = Math.PI;) 6 Scanners Below is an example of reading from the keyboard/console. 1 // importing n e c e s s a r y methods 2 import java. u t i l. Scanner ; 3 4 p u b l i c c l a s s S c a n n e r P r a c t i c e { 5 p u b l i c s t a t i c void main ( S t r i n g [ ] a r g s ) { 6 // I n i t i a l i z e s a Scanner o b j e c t c a l l e d r e a d e r 7 Scanner r e a d e r = new Scanner ( System. i n ) ; 8 // Prompting u s e r f o r an i n t e g e r 9 System. out. p r i n t ( Enter your f a v o r i t e i n t e g e r : ) ; 10 // Read and s t o r e an i n t 11 i n t f a v o r i t e n u m b e r = r e a d e r. n e x t I n t ( ) ; 12 // Prompting u s e r f o r a decimal 13 System. out. p r i n t ( Enter your f a v o r i t e decimal number : ) ; 14 // Read and s t o r e a double 15 double f a v o r i t e d e c i m a l = r e a d e r. nextdouble ( ) ; 16 // Prompting u s e r f o r a c h a r a c t e r 17 System. out. p r i n t ( Enter your f a v o r i t e c h a r a c t e r : ) ; 18 // Read and s t o r e a l e t t e r 19 char f a v o r i t e c h a r a c t e r = r e a d e r. next ( ). charat ( 0 ) ; // p r i n t i n g summary 22 System. out. p r i n t f ( Your f a v o r i t e i n t e g e r i s %d\nyour f a v o r i t e decimal number to 6 d e c i m a l s 23 i s %f \nyour f a v o r i t e c h a r a c t e r i s %c \n, favorite number, 24 f a v o r i t e d e c i m a l, f a v o r i t e c h a r a c t e r ) ; 25 r e a d e r. c l o s e ( ) ; // NOTE: You can a l s o use Java 8 s try catch r e s o u r c e. This g u a r a n t e e s your Scanner i s c l e a n e d up ( Scanner c l o s i n g, e t c. ). Example below : 28 t r y ( Scanner scan = new Scanner ( new F i l e ( f i l e n a m e ) ) ) { 29 // your code here 30 } 31 } 32 } On the console, it looks like this: Enter your favorite integer: 11 Enter your favorite decimal number: 3.14 Enter your favorite character: a Your favorite integer is 11 Your favorite decimal number to 6 decimals is Your favorite character is a 6.1 Suggestions, Warnings, and Resources Suggestion: Get in the habit of closing your Scanners Warning: When you go from line based processing (.nextline()) to token based processing (.next(),.nextdouble(),.nextint()) you MUST discard the new line character before you continue parsing. Resource: Use Oracle s documentation for more methods and examples

10 6.2 FAQs 1. Q: My code still works even though I didn t close my Scanner object, why do you guys teach so you have to close it? A: We teach it so you close your Scanners so you get in the habit of closing objects (better coding practice and when we get to PrintWriters you must close your object).

11 7 Practice Written Exam 7.1 Short Answer 1. Declare an integer named i0. 2. Initialize a float named f to Initialize a Scanner to read from the keyboard, called read. 4. Assign i0 to an integer entered from the user. 5. Close the Scanner. 6. Change the pre-assigned String variable called s to be all upper case. 7. Name the eight primitive types. 8. Question 8 might be better written as: Given the following code, write what would be printed to the console (write error if the code throws an error): 1 S t r i n g s = new S t r i n g ( Bob Marley ) ; 2 S t r i n g m = mummies ; 3 System. out. p r i n t l n (m. s u b s t r i n g ( 0, 3 ) + s. s u b s t r i n g ( 4 ) ) ; 4 System. out. p r i n t (m. charat ( 1 ) + + s. charat ( 1 ) ) ; 5 System. out. p r i n t l n ( s. indexof ( q ) + m. indexof ( 3 ) ) ; 6 System. out. p r i n t l n ( s. l e n g t h ( ) ) ; 7 System. out. p r i n t l n ( s + m) ; 8 System. out. p r i n t l n (m. indexof ( Ma ) ) ; 9 System. out. p r i n t l n ( s. l e n g t h ( ) m. l e n g t h ( ) ) ; 10 System. out. p r i n t l n ( s. s u b s t r i n g ( 0, 1 1 ) ) ; 11 System. out. p r i n t l n ( s. l e n g t h ( ) /m. l e n g t h ( ) ) ; 9. What is 18 % 3? 10. Write a switch statement based off of the character variable c. If c is a print hi, if c is b print okay, if c is c print then, if c is d print bye, if it is not a, b, c, or d print fine then. 11. Write an if statement that does the same thing as question Declare a Scanner called scan. Read in one word and store it into the predefined String variable called word. Print out the second through fourth character of word. Close your scanner. 13. Check to see if the predefined String variables s0 and s1 are equal. Print the result. 14. Check to see if the predefined int variables i0 and i1 are equal. Print the result.

12 7.2 Tracing Code For each question below, write what is printed. 1 import java. u t i l. Scanner ; 2 3 p u b l i c c l a s s Tracing { 4 p u b l i c s t a t i c void main ( S t r i n g [ ] a r g s ) { 5 i n t i = 3 ; 6 double d = ( double ) i ; 7 // Question 1 8 System. out. p r i n t f ( %d %f \n, i, d ) ; 9 10 Scanner keys = new Scanner ( System. i n ) ; 11 d = keys. n e x t I n t ( ) ; 12 i = ( i n t ) keys. nextdouble ( ) ; // Question 2 ( assume the u s e r e n t e r s 8 and r e s p e c t i v e l y ) 15 System. out. p r i n t f ( %d %.4 f \n, i, d ) ; S t r i n g r e s u l t = i n i t i a l r e s u l t ; // Question 3 20 i f ( d > 98) 21 r e s u l t = g r e a t e r than 98 ; 22 e l s e 23 r e s u l t = l e s s than or equal to 98 ; 24 System. out. p r i n t l n ( r e s u l t ) ; char grade = keys. next ( ). charat ( 0 ) ; 27 // Question 4 ( assume the u s e r e n t e r s a ( without the quotes ) ) 28 switch ( grade ) { 29 c a s e a : System. out. p r i n t l n ( Passing! ) ; 30 c a s e b : System. out. p r i n t l n ( Passing! ) ; 31 c a s e c : System. out. p r i n t l n ( Passing! ) ; 32 c a s e d : System. out. p r i n t l n ( Kinda s o r t a p a s s i n g ) 33 c a s e f : System. out. p r i n t l n ( Not r e a l l y p a s s i n g ) ; 34 d e f a u l t : System. out. p r i n t l n ( Not a grade l e t t e r r e c o g n i z e d ) ; 35 } 36 } 37 }

13 8 Programming Quiz Practice Exam 1. Declare a class with a main method 2. Import the Scanner class 3. Declare four String variables called name, city, state, school 4. Declare an int variable called age 5. Declare a double variable called gpa 6. Declare a Scanner that reads from the keyboard called reader 7. Prompt the user to enter their name 8. Using the Scanner read in their name and assign the value to name 9. Prompt the user to enter their age 10. Using the Scanner read in their age and assign the value to age 11. Prompt the user to enter their GPA 12. Using the Scanner read in their GPA and assign the value to gpa 13. Prompt the user to enter their school 14. Using the Scanner read in their school s name and assign the value to school 15. Prompt the user to enter their city 16. Using the Scanner read in their city s name and assign the value to city 17. Prompt the user to enter their state 18. Using the Scanner read in their state s name and assign the value to state. 19. Print a summary of the entered information in the format by printing: (a) Print their first name (ONLY the first name) (b) Print their age (c) Print their GPA with two decimal point accuracy (d) Print their school name (e) Print their city then their state An example run would look like: Enter your name: Bob Stevey Joe Enter your age: 18 Enter your GPA: Enter your school: Colorado State University Enter your city: Fort Collins Enter your state: Colorado Summary: First name: Bob Age: 18 GPA: 3.14 School Name: Colorado State University Fort Collins, Colorado 20. Close reader

14 9 Suggestions for Studying and Test Taking 9.1 Written When reading through code and writing the output: Write your variables on the side and as your variables change, you change your list on the side. Practice writing code in Eclipse and before you run your program guess what the output would be. is good practice for testing your own programs and also for the code tracing part of the exam. This If you need more tracing examples (or more coding examples in general), there is a Programs tab on the CS163/164 homepage. There are also examples on the Progress page. Write the variables, their values, and any changes made to those values to keep track of what is changing throughout the program. 9.2 Programming Quiz Go back to past recitations and assignments and redo them without using the Internet, friends, or past recitations/assignments. Practice writing code in Eclipse. Make up projects and problems or ask a TA and they can give you some challenges. Look at code, the more exposure you get to code (whether it s your own code or not) the easier it is to understand. Some sample code is under the Programs tab and the Progress Page. 9.3 Common Errors Scanner token processing(.next,.nextint(),.nextdouble()) to line processing (.nextline()). Need an extra.nextline() when going from token processing to line processing. Use.equals when comparing Strings, NOT ==! Incorrect brackets around conditional statements 9.4 Challenges CodingBat and Hackerrank offer good extra coding practice.

15 ANSWERS ON THE NEXT PAGE

16 10 Answers to Practice Written and Programming Problems 10.1 Written Short Answer 1. int i0; 2. float f = 4.0F; 3. Scanner read = new Scanner(System.in); 4. i0 = read.nextint(); 5. read.close(); 6. s = s.touppercase(); 7. int, double, char, float, long, boolean, byte 8. mummarley u-o-2 10 Bob Marleymummies -1 3 error switch ( c ) { 2 c a s e a : System. out. p r i n t l n ( h i ) ; break ; 3 c a s e b : System. out. p r i n t l n ( okay ) ; break ; 4 c a s e c : System. out. p r i n t l n ( then ) ; break ; 5 c a s e d : System. out. p r i n t l n ( bye ) ; break ; 6 d e f a u l t : System. out. p r i n t l n ( f i n e then ) ; break ; 7 } 11.1 i f ( c == a ) 2 System. out. p r i n t l n ( h i ) ; 3 e l s e i f ( c == b ) 4 System. out. p r i n t l n ( okay ) ; 5 e l s e i f ( c == c ) 6 System. out. p r i n t l n ( then ) ; 7 e l s e i f ( c == d ) 8 System. out. p r i n t l n ( bye ) ; 9 e l s e 10 System. out. p r i n t l n ( f i n e then ) ; Scanner scan = new Scanner ( System. i n ) ; 2 word = scan. next ( ) ; 3 System. out. p r i n t l n ( word. s u b s t r i n g ( 1, 4 ) ) ; 4 scan. c l o s e ( ) ; 13. System.out.println(s0.equals(s1)); 14. System.out.println(i0 == i1);

17 Tracing less than or equal to Passing! Passing! Passing! Kinda sorta passing Not really passing Not a grade letter recognized 10.2 Programming NOTE: Your solution may be different from the code below, as long as your output matches my output (in all cases), you are answer is fine. 1 import java. u t i l. Scanner ; 2 3 p u b l i c c l a s s PracticeProgramming { 4 p u b l i c s t a t i c void main ( S t r i n g [ ] a r g s ) { 5 Scanner r e a d e r = new Scanner ( System. i n ) ; 6 S t r i n g name = ; 7 i n t age ; 8 double gpa ; 9 S t r i n g c i t y =, s t a t e =, s c h o o l = ; // Goal : Only get f i r s t name 12 System. out. p r i n t ( Enter your name : ) ; 13 name = r e a d e r. nextline ( ) ; 14 // Checks i f t h e r e i s a space ( i. e. between f i r s t and l a s t name ) 15 i n t s p a c e i n d e x = name. indexof ( ) ; 16 // t h e r e i s a space 17 i f ( s p a c e i n d e x!= 1) 18 name = name. s u b s t r i n g ( 0, s p a c e i n d e x ) ; System. out. p r i n t ( Enter your age : ) ; 21 age = r e a d e r. n e x t I n t ( ) ; 22 System. out. p r i n t ( Enter your GPA: ) ; 23 gpa = r e a d e r. nextdouble ( ) ; 24 r e a d e r. nextline ( ) ; 25 System. out. p r i n t ( Enter your s c h o o l : ) ; 26 s c h o o l = r e a d e r. nextline ( ) ; 27 System. out. p r i n t ( Enter your c i t y : ) ; 28 // Could be m u l t i p l e words ( i. e. Colorado S p r i n g s ) 29 c i t y = r e a d e r. nextline ( ) ; 30 System. out. p r i n t ( Enter your s t a t e : ) ; 31 s t a t e = r e a d e r. nextline ( ) ; System. out. p r i n t l n ( Summary : ) ; 34 System. out. p r i n t l n ( F i r s t name : + name ) ; 35 System. out. p r i n t l n ( Age : + age ) ; 36 System. out. p r i n t f ( GPA: %.2 f \n, gpa ) ; 37 System. out. p r i n t l n ( School Name : + s c h o o l ) ; 38 System. out. p r i n t l n ( c i t y +, + s t a t e ) ; r e a d e r. c l o s e ( ) ; 41 } 42 }