Case Conversion

#include<stdio.h>
#include<conio.h>
void main()
{
char c;
clrscr();
printf("Enter a Charactor ");
scanf("%c",&c);
if(c>=65&&c<=90)
    {
    printf("Lower case equivalent is %c\n",c+32);
    }
 else
   {
    if(c>=97&&c<=122)
      {
      printf("Upper case equivalent is %c\n",c-32);
      }
    else
      {
      printf("NOt a Charactor");
      }
   }
getch();
}


OUTPUT:

Enter a character d

Upper case equivalent is D