Question

Write a program that will take a line of input and go through and print out that line again with all the uppercase letters swapped with the lowercase letters. JAVA

Using printf

Answer 1

Code:

import java.util.*;
class a
{
   public static void main(String args[])               //main method
   {
       Scanner sc=new Scanner(System.in);                   //creating an object for scanner
       String str=sc.nextLine();
       int i,j;
       char s[]=str.toCharArray();               //converting to array of characters since we can't change a string
       int len=s.length;                   //finding the length of the string
       i=0;
       while(i!=len)      
       {
           if(s[i]>='a' && s[i]<='z')
               s[i]=(char)(s[i]-32);           //converting lower to upper case
           else if(s[i]>='A' && s[i]<='Z')           //converting upper to lower case
               s[i]=(char)(s[i]+32);
           i++;
       }
       for(i=0;i<len;i++)
       {
           System.out.printf("%c",s[i]);           //printing the string character wise
       }
       System.out.println("\n");
   }
}