sicily 2075. 2.2 Computing the volume of a cylinder

Description

Write a program that reads in the radius and length of a cylinder and computes volume using the following formulas:
area = radius * radius * PI
volume = area * length
PI = 3.14159

Input

One line contains num1, num2 (both in double) represent the radius and length of a cyliner.

Output

The volume in one line.

Hint

use the following code for output:

cout << answer<< endl;

刷一题C++体会一下

#include<iostream>
#define PI 3.14159
using namespace std;
int main()
{
    double a, r, answer, l;
    
    cin >> r >> l;
    answer = r*r*PI*l;
    cout << answer<< endl;
    return 0;
}