Do you want to convert char to int in C++? Okay, I will help you. Let’s follow my suggestions below. In the C++, there are a lot of methods to convert a char type variable into an int, but I find the most effective ways are stringstream, stoi() and typecasting.

1, Stringstream method

A single character represented as a stringstream object can be converted to an integer or any other numeric value. For example: I run following program:

#include <iostream>
#include <string>
#include <sstream>
using namespace std;
int main()
{
stringstream str;

str << "8"; int x; str >> x;
cout<<"Converted value of character 8 :"<<x;
}

Then I receive this output:

Converted value of character 8 :8

2, stoi() method

Below is the program I use stoi() method to convert char to int:

#include <iostream>
#include <string>
using namespace std;
int main() {
char s1[] = "45";
char c = 's';

int x = stoi(s1);
cout << "The value of x : " << x;

int y = (int)(c);
cout << "\nThe value of y : " << y;

return 0;
}

Output:

The value of x : 45 
The value of y : 115

3, Typecasting method

Assume that there is a character contains a digit, such as ‘X,’ and I want to convert it to an integer that only has the value X, not the ascii value. If char includes the value ‘6,’ the converted int value should also be 6. Let’s look at how I can accomplish this.

#include <iostream>
int main()
{
char ch = '6';
// Let's check whether character is digit or not
if (isdigit(ch))
{
// Convert character to integer
int num = ch - '0';
std::cout << num <<std::endl;
}
return 0;
}

The output I get:

54