C++ - 我在输出数字和字母时遇到问题

Question

我对 C++ 和一般编程还是很陌生，所以要温柔。

给定圆心和圆上的一个点，您可以使用此公式求圆的半径。编写一个程序，提示用户输入圆心和圆上的一个点。然后程序应该输出圆的半径、直径、周长和面积。您的程序必须至少具有以下功能：

calculateRadius：接收圆心和点的 x-y 坐标（由用户输入）并计算点之间的距离。该值作为圆的半径返回。

calculateArea：接收圆的半径，计算并返回圆的面积。

calculatePerimeter：接收圆的半径，计算并返回圆的周长。

输出应该清楚地显示结果圆的半径、面积和周长。

这是我目前所拥有的，它给了我数字和字母作为输出。

#include <iostream>
#include <cmath>
#define PI 3.141592

using namespace std;

int calculateRadius(float x1, float x2, float y1, float y2);
int calculateArea(float radius);
int calculatePerimeter(float radius);

int main()
{
    float x1;
    float x2;
    float y1;
    float y2;

    cout << "Please enter the first X Coordinate: " << endl;
    cin >> x1;
    cout << "Please enter the first Y Coordinate: " << endl;
    cin >> y1;

    cout << "Please enter the second X Coordinate: " << endl;
    cin >> x2;
    cout << "Please enter the second Y Coordinate: " << endl;
    cin >> y2;

    cout << "The radius of the circle is: " << calculateRadius << endl;
    cout << "The diameter of the circle is: " << endl;
    cout << "The cirfumference of the circle is: " << calculatePerimeter << endl;
    cout << "The area of the circle is: " << calculateArea << endl;

    system("pause");
    return 0;
}

int calculateRadius(float x1, float x2, float y1, float y2)
{
    float distance;
    float radius;

    distance = sqrt((pow(x2 - x1, 2)) + (pow(y2 - y1, 2)));

    radius = (distance / 2);

    return radius;
}

int calculateArea(float radius)
{
    float area;

    area = PI * pow(radius, 2);

    return area;
}

int calculatePerimeter(float radius)
{
    float perimeter;

    perimeter = 2 * PI * radius;

    return perimeter;
}

Answer 1

您还需要将函数的返回类型从 int 更改为 float，因为您使用的是单精度。

Answer 2

你需要为函数指定参数

#include <iostream>
#include <cmath>
#define PI 3.141592

using namespace std;

int calculateRadius(float x1, float x2, float y1, float y2);
int calculateArea(float radius);
int calculatePerimeter(float radius);

int main()
{
    float x1;
    float x2;
    float y1;
    float y2;

    cout << "Please enter the first X Coordinate: " << endl;
    cin >> x1;
    cout << "Please enter the first Y Coordinate: " << endl;
    cin >> y1;

    cout << "Please enter the second X Coordinate: " << endl;
    cin >> x2;
    cout << "Please enter the second Y Coordinate: " << endl;
    cin >> y2;

    cout << "The radius of the circle is: " << calculateRadius(x1,x2,y1,y2) << endl;
    cout << "The diameter of the circle is: " << endl;
    cout << "The cirfumference of the circle is: " << calculatePerimeter(x1) << endl;
    cout << "The area of the circle is: " << calculateArea(x1) << endl;

    system("pause");
    return 0;
}

int calculateRadius(float x1, float x2, float y1, float y2)
{
    float distance;
    float radius;

    distance = sqrt((pow(x2 - x1, 2)) + (pow(y2 - y1, 2)));

    radius = (distance / 2);

    return radius;
}

int calculateArea(float radius)
{
    float area;

    area = PI * pow(radius, 2);

    return area;
}

int calculatePerimeter(float radius)
{
    float perimeter;

    perimeter = 2 * PI * radius;

    return perimeter;
}