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  1. #include <iostream>
  2. #include <cctype>
  3.  
  4. int main()
  5. {
  6.     double temp = 42 + 3*3.1415925;
  7.     std::cout << isdigit(temp); // why is this returning false?
  8.  
  9.     // I am trying to detect "non-numeric" input.
  10.  
  11.     return 0;
  12. }
Success #stdin #stdout 0.01s 2680KB
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Standard input is empty
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1
https://ideone.com/u7JOZJ
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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