c++ - 在程序中一起使用 If 和 Switch 语句

Question

我是一名学生，我正在尝试制作一个非常简单的程序来显示用户输入的角度的象限。

但是，如果用户将角度输入为 0,90,180 或 270，我希望它显示角度在 X 轴或 Y 轴上。

我确实将这 4 个条件放在 if 语句中，但代码并没有在那里终止，而且我还得到了与该角度对应的象限号。如何在 if 语句之后终止这 4 个角的代码？

#include <iostream.h>
void main()

{
int angle;

cout<<"Enter an angle: ";
cin>>angle;

if (angle==90) cout<<"The angle lies on the positive Y axis";
else if (angle==0) cout<<"The angle lies on the positive X axis";
else if (angle==180) cout<<"The angle lies on the negative X axis";
else if (angle==270) cout<<"The angle lies on the negative Y axis";


angle=(angle/90)+1;

switch(angle)
{
case 1: cout<<"First Quadrant"; break;
case 2: cout<<"Second Quadrant"; break;
case 3: cout<<"Third Quadrant"; break;
case 4: cout<<"Fourth Quadrant"; break;
default: cout<<"That is not a valid angle.";

}
}

Answer 1

例如稍微修改一下:

int quadrant=(angle/90)+1;

if (angle==90) cout<<"The angle lies on the positive Y axis";
else if (angle==0) cout<<"The angle lies on the positive X axis";
else if (angle==180) cout<<"The angle lies on the negative X axis";
else if (angle==270) cout<<"The angle lies on the negative Y axis";
else
switch(quadrant)
{
    case 1: cout<<"First Quadrant"; break;
    case 2: cout<<"Second Quadrant"; break;
    case 3: cout<<"Third Quadrant"; break;
    case 4: cout<<"Fourth Quadrant"; break;
    default: cout<<"That is not a valid angle.";

}