Question

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

Answer 1

#include <iostream>
  
int main() {
    std::string str = "-19";
      
    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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