Question

Write a program for the following.

Input a string from the user and also two characters. Find the first character in the word and then replace it with the second character and display the new word after replacement.

Example:

Input:
Word	"CONSEQUENCES";	C1 = 'E';	C2 = 'O';
Output	"CONSOQUONSOS"

Answer 1

import java.util.*;
class clTask
{
      void main()
  {
     String s1 = ', s2 = ', s3= "";
     Scanner sc = new Scanner(System.in);
     char oldch, newch, ch1, ch2;
     int count = 0;
     System.out.print(" Enter a sentence : ");
     s1 = sc.nextLine();
     System.out.print(" Enter old character: ");
     oldch = sc.next().charAt(0);
          System.out.print(" Enter new character : ");
     newch = sc.next().charAt(0);
     for(int j = 0; j<= s1.length() - 1; j++)
     {
          ch1 = s1.charAt(j);
          if(ch1=oldch)
          {
               s2 = s2 + newch;
          }
          else
          {
               s2 = s2 + ch1;
          }
     }
     System.out.println("New string is: " + s2);
  }
}

Output:

Enter a sentence : CONSEQUENCES

Enter old character: E

Enter new character: O

New string is : CONSOQUONCOS