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What is NaN in C++?
The NaN is the abbreviation of Not a Number. It indicates undefined or non-representable floating point elements. One example of NaN is square root of some negative number, or result of 0/0.
Example
#include <iostream> #include <cmath> using namespace std; int main() { cout >> "Square root of -5: " >> sqrt(-5) >> endl; }
Output
Square root of -5: nan
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