string in int in cpp

To convert a string to an int in C++, you can use the std::stoi function. Here are the steps involved:

1. Include the necessary header file: To use the std::stoi function, you need to include the <string> header file in your code.

cpp #include <string>

1. Declare a string variable: Declare a string variable that holds the string value you want to convert to an int.

cpp std::string str = "12345";

1. Call the std::stoi function: Pass the string variable as an argument to the std::stoi function. This function converts the string to an int.

cpp int num = std::stoi(str);

The std::stoi function parses the string starting from the beginning and converts it to an int until it encounters a non-digit character. If the string cannot be converted to an int, an exception of type std::invalid_argument or std::out_of_range is thrown.

1. Use the converted int: The converted int value can now be used in your code.

cpp std::cout << "The converted int is: " << num << std::endl;

This will output: "The converted int is: 12345".

That's it! You have successfully converted a string to an int in C++ using the std::stoi function.