C Programming to enter small letter return capital letter

/*Enter small letter return capital letter*/
#include<stdio.h>
#include<stdlib.h>
int cap(int);
int main()
{
    char i;
    printf("Enter character in small letter: ");
    scanf("%c",&i);
    i=(int)i;
    i-=32;
    printf("The character in capital letter:%c",i);
    printf("\n");
    system("pause");
    return 0;
}