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What is NaN in C++ and How to Handle It?
What is NaN in C++ and How to Handle It?
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rashmi agar
57 posts
Mar 16, 2025
9:50 PM
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I’m encountering some strange behavior in my c++ nan related to NaN (Not a Number). I learned that NaN can appear when performing undefined operations like:
cpp
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Edit
#include
#include
int main() {
double a = 0.0;
double result = sqrt(-1); // Produces NaN
double div = a / a; // Also produces NaN
std::cout << "sqrt(-1): " << result << std::endl;
std::cout << "0/0: " << div << std::endl;
return 0;
}
I was wondering:
How can I check if a value is NaN?
What’s the best way to handle NaN values in calculations?
Are there cases where NaN can silently propagate through calculations?
From my research, it looks like std::isnan() can be used to check for NaN, but I’m not sure if there are any caveats I should be aware of. Also, why does NaN == NaN return false?
Would love to hear best practices on detecting and handling NaN in real-world C++ applications.
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qumar
2788 posts
Mar 16, 2025
10:18 PM
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I completely understand everything you have said. Actually, I browsed through your additional content articles and I think you happen to be absolutely right. Great job with this online site. five88
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