To convert Upper case character to lower case and vice-versa.

PROCEDURE:-

      1.input a character
      2.if the given character is small case convert it to upper case
      3.else if the given character is upper case convert it to lower case
      4. after conversion print the character

CODE:-

#include<stdio.h>
#include<ctype.h>
void main()
{
char c;
printf(“enter a character”);
 c=getchar();
 if (islower(c))
putchar(toupper(c));
 else
putchar(tolower(c));
}


Input:- enter a character
                a
Output:- A
Input:-enter a character
               A
Output:-a