Question

How to convert string to int number in C++

Answer 1

#include <iostream>
#include <string>
#include <sstream>
 
using std::cout;
using std::endl;
using std::string;
 
int main()
{
    string str = "987";
 
    std::stringstream ss(str);
 
    int n = 0;
    ss >> n;
 
    cout << n;
}

 
/*
run:
 
987
 
*/

 

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Answer 2

#include <iostream>
#include <string>
 
using std::cout;
using std::endl;
using std::string;
 
int main()
{
    string s = "872 c++";
 
    int n = stoi(s);
 
    cout << n << endl;
}


 
/*
run:
 
872
 
*/

 

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