#include <stdio.h>
 
//関数のプロトタイプ宣言
int max(int x, int y);
 
int main(void) {
    int a, b, c, d;
    int max_value;
 
    // 4つの値を入力
    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の入れ子構造を利用
    max_value = max(max(a, b), max(c, d));
 
    printf("最大値 = %d\n", max_value);
 
    return 0;
}
 
//max関数の定義
int max(int x, int y) {
    return (x > y) ? x : y;
}
 
 
 
 
 

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