Question

How to check if string is integer in C++

Answer 1

#include <iostream>
#include <bitset>

bool isNumber(const std::string& s) {
   	std::string::const_iterator it = s.begin();
   	
    while (it != s.end() && isdigit(*it)) 
            it++;
    
    return !s.empty() && it == s.end();
}

int main()
{
    std::string s = "8983";
    
    std::cout << isNumber(s);
    std::cout << "\n";
    std::cout << isNumber("F15");
}




/*
run:

1
0

*/

 

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