How can i change string number into integer value??

Question

Ex: "5"->5

Answer 1

C++ has a number of conversion functions for this purpose, which you can find in the <string> header. Just follow the link to the documentation and scroll down a bit to the section "Numeric Conversions":

https://en.cppreference.com/w/cpp/string/basic_string

Answer 2

No, ASCII codes only exist for single characters.

Answer 3

#include <iostream>
#include <sstream>
using namespace std;

int main() {
string no_str = "3";
stringstream ss(no_str);

int number;
ss >> number;

cout << number;
return 0;
}

you can do this one way using stringstream and the other way is using stoi in <string> like Shadow said there are many ways to achieve this.

Answer 4

Do we have ascii code for more than 1 digit number?? Ex. 10 or 111