通过键盘输入圆的半径r,求圆的周长(周长=2*∏*r),并输出结果。完整答案
时间: 2023-05-14 17:06:06 浏览: 44
Sure, I can help you with that! Here's the code to calculate the circumference of a circle based on the input radius:
```
#include <iostream>
using namespace std;
int main() {
double radius, circumference;
const double PI = 3.14159265358979323846;
cout << "Please enter the radius of the circle: ";
cin >> radius;
circumference = 2 * PI * radius;
cout << "The circumference of the circle is: " << circumference << endl;
return 0;
}
```
This code prompts the user to input the radius of the circle, calculates the circumference using the formula `2 * PI * radius`, and then outputs the result. Note that we use the constant `PI` to represent the value of pi, which is approximately 3.14159265358979323846.
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