#include <stdio.h>
#include <stdlib.h>

extern int max(int a, int b);  /* Prototype of function */

int main(void) {
    int a, b, m;
    while (1) {
        printf("a, b: ");
        if (scanf("%d%d", &a, &b) < 2)
            break;
        m = max(a, b);
        printf("max(a, b) = %d\n", m);
    }
    return 0;
}