Question

1. [after §3.22 − easy] String Processing :

Consider the following code fragment:

1 int a = 20;

2 int b;

3 double x = 3.5;

4 String s = "All";

5 char ch;

6

7 x += a;

8 x--;

9 a /= 4 - 1;

10 b = s.length();

11 b += 4;

12 s += "is well";

13 ch = s.charAt(b);

14 System.out.println("a = " + a + ", b = " + b);

15 System.out.println("x = " + x + "\ns = " + s);

16 System.out.println("ch = " + ch);

Trace the above code, using the following format:

Use a separate row for each statement.

Write a Java program that executes the commands in the code fragment.

Answer 1

import java.io.*;

class StringProcessing {
        public static void main (String[] args) {
            int a=20,b;
            double x=3.5;
            String s="All";
            char ch;
            x+=a;             //return x=23.5
            x--;              //return x=22.5
            a/=4-1;           //return a=20/(4-1)=6
            b=s.length();     //return b=3 as length of s is 3
            b+=4;              //return b=b+4=3+4=7;
            s+="is well";      //s="All"+"is well"= "Allis well"
            ch=s.charAt(b);    //ch=s.charAt(7)= e 
                System.out.println("a= "+a+", b= "+b);
                System.out.println("x= "+x+"\ns= "+s);
                System.out.println("ch= "+ch);
        }
}