c++ - 为什么我输入的数字只能读到6位有效数字？

Question

我正在尝试运行以下程序并且它可以运行，但是当我输入一个超过 6 位小数的值时，它会不断四舍五入/截断，例如2.999999 --> 3. 如何设置它停止执行此操作？

int main()
{

    double n=0, x=0; 

    while (cin >> n >> x) //will keep going until an integer is not entered
    {
       cout << "You entered the two integers " << x << " and " << n << endl;

       if (x-n <= (1.0/10000000) && n-x <= (1.0/10000000)) 
          cout << "The numbers are almost equal" << endl;
    }

return 0;

}

Answer 1

您可以使用 std::setprecision 更改打印值的精度:

cout << "You entered the two integers " << setprecision(20) << x
     << " and " << n << endl;

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