/* Program# 38
   date : 25-12-2008
   Convert  Lowercase  to uppercase
*/

#include <stdio.h>
main(){
char a;
printf("\nEnter a lowercase alphabet :");
scanf("%c",&a);
if(a>=97 && a<=122){
a=a-32;
printf("\nuppercase letter is %c \n",a);
}
else
printf("\n%c is Not Lowercase letter\n",a);
}

$ gcc p38.c  

Now the executable file is stored as a.out, to run
the program,

$ ./a.out

Enter a lowercase alphabet :h

uppercase letter is H 
$