#include <stdio.h>

void swap(int *x, int *y){
    int tmp = *x;
    *x = *y;
    *y = tmp;
}

int main() {
    int a = 3, b = 1, c = 2;

    // 昇順に並べる
    if(a > b) swap(&a, &b);
    if(a > c) swap(&a, &c);
    if(b > c) swap(&b, &c);

    printf("a=%d, b=%d, c=%d\n", a, b, c);

    return 0;
}