To upper

#include "stdio.h"
char upr(char v)
{
     if(v>='a'&&v<='z')
     return ('A'+v-'a');
     else
     return (v);
}
int main (void)
{
    char ch;
    printf("Enter a character:\n");
    scanf("%c",&ch);
    printf("The upper form of %c is %c\n", ch, upr(ch));
    system("pause");
    return 0;
}