#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=1,b=5,c=3,d=4;
    int max_val;
//ここ↓を埋めてね２
max_val = max(max(a, b), max(c, d));
 printf("a=%d, b=%d, c=%d, d=%d のうち、最大値は %d です。\n", a, b, c, d, max_val);
	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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