#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
      a=2;
      b=5;
      c=3;
      d=4;
 
      int m = max(max(a, b), max(c, d));
    printf("最大値は %d です\n", m);
 
    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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