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  1. #include <iostream>
  2. #include <string>
  3.  
  4. bool isDigit(std::string const&);
  5.  
  6. int main()
  7. {
  8. 	std::string s, s1;
  9. 	std::cin >> s;
  10.  
  11. 	if(isDigit(s)) {
  12. 		std::cout << "Input is an int.\n";
  13. 	} else {
  14. 		std::cout << "Input is not an int.\n";
  15. 	}
  16.  
  17. 	std::cin >> s1;
  18. 	if(isDigit(s1)) {
  19. 		std::cout << "Input is an int.\n";
  20. 	} else {
  21. 		std::cout << "Input is not an int.\n";
  22. 	}
  23.  
  24. 	return 0;
  25. }
  26.  
  27. bool isDigit(std::string const& s) {
  28. 	bool isDigit = true;
  29. 	int ssize = static_cast<int>(s.size());
  30. 	for(int i = 0 ; i < ssize ; ++i) {
  31. 		if(!isdigit(s[i])) {
  32. 			isDigit = false;
  33. 			break;
  34. 		}
  35. 	}
  36.  
  37. 	return isDigit;
  38. }
  39.  
Success #stdin #stdout 0s 3432KB
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4.
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stdout
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Input is not an int.
Input is an int.
https://ideone.com/hgfSPe
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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