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  1. #include <iostream>
  2. #include <sstream>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int var = -1;
  7. 	std::istringstream stream("3.5");
  8. 	if (stream >> var) // at this point, the input stream allows "3" to be parsed
  9. 	{
  10. 	    std::cout << "Reading succeeded, var = " << var << "\n";
  11.     }
  12.     else
  13.     {
  14.     	std::cout << "Reading didn't succeed, var = " << var << "\n";
  15. 	}
  16. 	if (stream >> var) // at this point, the input stream tries to fit ".5" into var, which fails
  17. 	{
  18. 	    std::cout << "Reading succeeded, var = " << var << "\n";
  19.     }
  20.     else
  21.     {
  22.     	std::cout << "Reading didn't succeed, var = " << var << "\n";
  23. 	}
  24. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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Reading succeeded, var = 3
Reading didn't succeed, var = 0
https://ideone.com/gikyFq
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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