浮点异常C ++为什么和什么是？ [英] Floating Point Exception C++ Why and what is it?

问题描述

我正在为Euler项目问题​​3创建一个程序，虽然这可能并不重要，结果，我目前试图让这个代码采取一个数字，并测试如果它是素数。现在，然后在我得到排除故障的功能，它给我的错误浮点异常输入数字后。这里是代码：

I'm building a program for the Euler projects question 3, and while that might not really matter as a result I'm current trying to make this code take a number and test if it is prime or not. Now then before I get to troubleshoot the function it gives me the error "floating point exception" right after inputting the number. Here's the code:

int main()
{
    int input;
    cout << "Enter number: " << endl;
    cin>> input;
    int i = input/2;
    int c;
    for (i>0; i--;) {
        c= input%i;
        if (c==0 || i == 1)
            cout << "not prime" << endl;
        else
            cout << "prime" << endl;
    }
    return 0;
}

所以基本上为什么它给我一个浮点异常， ？

so essentially why is it giving me a floating point exception and what does that even mean?

推荐答案

浮动点数是计算机通常表示不是整数的数字 - 基本上是具有小数点的数字。在C ++中，用 float 而不是 int 来声明它们。浮点异常是当您尝试使用浮点数执行不可能的操作（如除以零）时出现的错误。

A "floating point number" is how computers usually represent numbers that are not integers -- basically, a number with a decimal point. In C++ you declare them with float instead of int. A floating point exception is an error that occurs when you try to do something impossible with a floating point number, such as divide by zero.

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