Thread: Code giving undesired output..

/*Toggle-Case : If lower-case character entered, then change to upper-case and vice-verse :*/

Code:

#include<stdio.h>
#include<conio.h>
#include<ctype.h>

void main()

{

   clrscr();

   int a,b;
   char ch;

   do

   {
     printf("\n\n Enter any alphabet : ");
     a=getchar();

     if(a>=65&&a<=90)

      {

    b=tolower(a);
    printf("\n\n The lower-case for %c is : %c ",a,b);

      }

     else if(a>=97&&a<=122)

      {

    b=toupper(a);
    printf("\n\n The upper-case for %c is : %c ",a,b);

      }

    else

      printf("\n\n Wrong Input..!!! Alphabet ONLY ");

    printf("\n\n Do you want to continue ? (y/n) : ");

    ch=getche();

   }while(ch=='y'||ch=='Y');

    getch();

 }