#include <stdio.h>
//関数のプロトタイプ宣言
//ここ↓を埋めてね１
int max(int, int);
//main関数
int main(void) {
    int a,b,c,d;
//ここ↓を埋めてね２ 
	a = 1;
	b = 5;
	c = 3;
	d = 4;
	printf("max((%d, %d), (%d, %d)) = %d\n", a, b, c, d, max(max(a, b), max(c, d)));
 
	return 0;
}
 
//max関数の定義
int max(int x, int y){
//ここ↓を埋めてね３
	int m;
	m = x;
	if(m < y) {
		m = y;
	}
	return m;
}
 
 
 
 
 

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