#include <stdio.h>
#define PI 3.141592653589793
 
// 円錐の体積を求める関数
double delta_cone(double r, double h) {
    return (1.0/3.0) * PI * r * r * h;
}
 
int main() {
    double r, h, volume;
 
    // ユーザーに半径と高さの入力を求める
    printf("円の半径を入力してください: ");
    scanf("%lf", &r);
    printf("円錐の高さを入力してください: ");
    scanf("%lf", &h);
 
    // delta_cone関数を呼び出して体積を計算
    volume = delta_cone(r, h);
 
    // 計算結果を表示
    printf("円錐の体積は: %.2f\n", volume);
 
    return 0;
}
 

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