C++ Code Example: Convert different data types to int

In C++, you can convert different data types to an integer using the stoi() function from the <string> library.

Here’s an example of how to use stoi() to convert a string to an integer:

#include <iostream>
#include <string>

int main() {
    std::string str = "123";
    int num = std::stoi(str);
    std::cout << num << std::endl;
    return 0;
}

In this example, we declare a std::string variable named str and initialize it with the value "123". We then use the std::stoi() function to convert str to an integer and store the result in an int variable named num. Finally, we print the value of num to the console using std::cout.

You can also use stoi() to convert other data types to integers, such as char, double, and float. Here’s an example of how to use stoi() to convert a char to an integer:

#include <iostream>
#include <string>

int main() {
    char c = '5';
    int num = std::stoi(std::string(1, c));
    std::cout << num << std::endl;
    return 0;
}

In this example, we declare a char variable named c and initialize it with the value '5'. We then use std::string(1, c) to convert c to a std::string, and pass the resulting string to std::stoi() to convert it to an integer.

Note that when converting a char to a std::string, we pass 1 as the first argument to std::string() to indicate that we want to create a string of length 1 containing the character c.

Overall, the stoi() function is a useful way to convert different data types to integers in C++.