#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 x, int y);
 
//main関数
int main(void) {
    int a,b,c,d;
 
    //ここ↓を埋めてね２
    printf("4つの整数を入力してください: ");
    scanf("%d %d %d %d", &a, &b, &c, &d);
 
    // max関数を入れ子にして最大値を求める
    printf("最大値は %d です。\n", 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
    // xとyを比較し、大きい方の値を返す
    return (x > y) ? x : y;
}
 
 

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