#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);
 int result = max(max(a, b), max(c, d));
 
    printf("最大値は %d です\n", result);
	return 0;
}
 
//max関数の定義
int max(int x, int y){
//ここ↓を埋めてね３
return (x > y) ? x : y;
}
 
 
 

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