#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;
    int biggest = max( max (a,b), max (c,d));
    printf("%dと%dと%dと%dのうち最も大きいのは%d",a,b,c,d,biggest);
	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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