Answered: Write a program that asks the user to…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Instructions from your teacher:

Write a program that asks the user to enter a character. Then pass the character to the following methods.

changeCase() – if the character is lower case then change it to upper case and if the character is in upper case then change it to lower case.

Example output is given below:

Enter a character

a is equivalent to A

Note: Java represents character using Unicode encoding and ‘A’ to ‘Z’ is represented by numbers 65 to 90 and ‘a’ to ‘z’ is represented by numbers 97 to 122. So to convert ‘A’ to ‘a’ you need to add (97-65) to A and then cast it to Character type since the addition will change its type to integer.

You can use the following code to read a character from console. When you call charAt(i) method for any String it returns the character at index i. The index of first character is 0, the index of second character is 1 and so on.

Scanner input = new Scanner(System.in); char ch =input.next().charAt(0);

If you cannot pass the tests, please try following for troubleshooting:

changeCase('c'); # should be 'C'

changeCase('C'); # should be 'c'

class Main {

public static void main(String[] args) {

char a = (char) 65;

System.out.print(a);

}

public static char changeCase(char c) {
// ASCII
// a <==> 97 b = 98,
// A 65 B 66

// 'a' - (97-65) = 'A'
// 'A' + (97-65) = 'a'
return 'a';
}
}

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