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  1. #include<iostream>
  2. #include<sstream>
  3. using namespace std;
  4.  
  5.  
  6. int main()
  7. {
  8.       string s;
  9.  
  10.       cin >> s;
  11.  
  12. 	  stringstream ss;
  13. 	  ss << s;
  14.  
  15. 	  float num = 0;
  16.  
  17. 	  ss >> num;
  18.  
  19. 	  if(ss.good()) {
  20. 		  cerr << "No Valid Number" << endl;
  21. 	  }
  22. 	  else if(num == 0 && s[0] != 0) {
  23. 		  cerr << "No Valid Number" << endl;
  24. 	  }
  25. 	  else {
  26. 		cout << num << endl;
  27. 	  }		
  28. }
Success #stdin #stdout 0s 3032KB
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https://ideone.com/LKSQFq
Number Validation
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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