Mala u Velika

#include <stdio.h>
#include <ctype.h>

/*
Mala u Velika slova
*/
int main() {
    char str[100];
    char* s;
    printf("Uneti string: ");
    gets(str);
    s = str;
    while (*s) {
        if (isupper(*s)) *s = tolower(*s);
        else if (islower(*s)) *s = toupper(*s);
        s++;
    }
    printf("String : %s", str);
    getchar();
    getchar();
    return 0;
}