//THE upper && lower case and useing else//              
#include<stdio.h>
int main (void)
{
char ch= 'W';   
if(ch>='a' && ch<='z')   
{
printf("this is lower case :%c\n",ch);
}
else 
{
printf("this is upper case :%c\n",ch);
}
return 0;
}

this is upper case :W