c ++负平方根 [英] c++ negative square root

问题描述

我的目标是如果平方根为负，则打印 *** 。但我不能想办法改变默认 nan 文本到 ***

  for（int i = x1; i <= x2; i ++）{
 double y = sqrt（pow * i-500）; 
 if（y =？）{
 outFile< ***;所以，我应该在if语句中写什么来使它成为可能？或者有另一种方法检查y是否为nan然后打印 *  
解决方案
检查对平方根函数的负输入？
  for（int i = x1; i < = x2; ++ i）
 {
 double x = pow（i，2）+ 3 * i-500; 
 if（x< 0）
 {
 outFile< ***; 
} 
 else 
 {
 outFile< sqrt（x）; 
} 
} 
  
 
My goal is to print *** if the square root is negative. But I can't think of a way to change default nan text to ***
for(int i=x1;i<=x2;i++){
   double y = sqrt(pow(i,2)+3*i-500);
    if(y = ?){
        outFile << "***";
    }
So, what should I write in the if statement to make it possible? Or maybe there is another way to check if the y is nan then print *
解决方案
How about checking for a negative input to the square root function?
for (int i = x1; i <= x2; ++i)
{
    double x = pow(i, 2) + 3*i - 500;
    if (x < 0)
    {
        outFile << "***";
    }
    else
    {
        outFile << sqrt(x);
    }
}


                        
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