how to convert a char into an int c++ code example

Example 1: char* to int in cpp

int x = std::stoi("42")

Example 2: converting char to integer c++

int x  = '9' - 48;
// x now equals 9 as an integer

Example 3: converting char to int in c++

#include <sstream>

using namespace std;

int main()
{
    stringstream str;
    
    str << "1";

    double x;
    str >> x;
}