Answers for "string to integer function in c++"

convert string to number c++

#include <iostream>
#include <sstream>
using namespace std;
int main()
{
	string str = "123456";
 	int n;
  	stringstream ( str ) >> n;
	cout << n; //Output:123456
	return 0;
}

how to string to integer in c++

#include<string>
string str1 = "45"; 
string str2 = "3.14159"; 
string str3 = "31337 geek";

int myint1 = stoi(str1);
std::cout<<stoi(str1);

how to convert string to int in c++

string s = "123";
int n = s.size();
int num = 0;
 for(int i = 0 ; i<n;i++)//this what stoi built function do XD
 {
  num = num*10+(s[i]-'0');
 }