#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("%d %d %d %dの中で最大の数は%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
		return (x>y)?x:y;//もし x が y より大きければ x を返し、そうでなければ y を返す」
}
 
 
 

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