How to convert char to int in c++

Convert char to int c++

char a = '6'; //bounded by 0 and 9
int n1 = a - '0'; 
int n2 = a - 48; 
int n3 = std::stoi(&a);

char a = '4';
int ia = a - '0';

int x = character - '0'

int x  = '9' - 48;//converts '9' to 9 as an int

#include <sstream>

using namespace std;

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

    double x;
    str >> x;
}

-5

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