#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 z;
    z=max(max(a,b),max(c,d));
  printf("a,b,c,dのうち、最大の数は%dである",z);
	return 0;
}
 
//max関数の定義
int max(int x, int y){
//ここ↓を埋めてね３
int m;
  m=x;
if(x<y){
m=y;
}
return m;
}
 
 
 

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