PROGRAM TO CHANGE THE CASE(LOWER-UPPER/UPPER-LOWER)OF A CHARACTER ENTERD FROM THE KEYBOARD

int main()
{
char c;
c=getchar();
if(c>65&&c<90)
{
c=c+32;
printf("%c",c);
}
else
if(c>=97&&c<=122)
{
c=c-32;
printf("%c",c);
}
}