Question

How to check if string is a positive integer in C++

Answer 1

#include <iostream>
   
int main() {
    std::string str = "12";
       
    try {
         
        int n = stoi(str);
         
        std::cout << (n >= 0 ? "yes" : "no") << "\n";
      
        std::cout << (n >= 0) << "\n";
    } catch(...) {
        std::cout << "Not a number" << "\n";
    }  
}
 
 
   
   
/*
run:
   
yes
1
   
*/

 

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