#include <stdio.h>
 
//関数のプロトタイプ宣言
int max(int x, int y);
 
//main関数
int main(void) {
    int a,b,c,d;
    printf("4つの整数を入力してください: ");
    scanf("%d %d %d %d", &a, &b, &c, &d);
 
    // max関数を入れ子にして4つの最大値を求める
    int result = max(max(a, b), max(c, d));
 
    printf("最大値は %d です。\n", result);
 
    return 0;
}
 
//max関数の定義
int max(int x, int y){
    if(x > y){
        return x;
    } else {
        return y;
    }
}
 

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