#include <stdio.h>
 
// プロトタイプ宣言
double max(double x, double y);
 
int main(void) {
    double a, b, c, d;
 
    // 4つの数値を入力
    printf("Enter four numbers: ");
    scanf("%lf %lf %lf %lf", &a, &b, &c, &d);
 
    // max関数の入れ子を使って最大値を求める
    double result = max(max(a, b), max(c, d));
 
    // 結果を表示
    printf("The maximum value is: %.2f\n", result);
 
    return 0;
}
 
// max関数: 2つの値のうち大きい方を返す
double max(double x, double y) {
    return (x > y) ? x : y;
}

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