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  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  4. bool isint(const string& s){
  5.   size_t i =0;
  6.   bool state;
  7.   for(;i<s.size();i++){
  8.     if (!isdigit(s[i]))return false;
  9.     state = true;
  10.     }
  11.     return state;
  12.   }
  13. int main() 
  14. {
  15.     string a;
  16.     cout<<"enter";
  17.     cin>>a;
  18.     try{
  19.     if(!isint(a)){
  20.       cout<<"not an int";
  21.       }
  22.     else{
  23.       cout<<"recorded";
  24.     }
  25.  
  26.     }
  27.     catch(...){
  28.       cout<<"error";
  29.     }
  30.  
  31. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/5tWGlB
language:
C++14 (gcc 8.3)
created:
3 hours ago
visibility:
public

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