Question

How do I convert a string to an integer or a floating-point number?

Answer 1

To convert a string to an integer, you can use the std::stoi function, and to convert a string to a floating-point number, you can use the std::stof or std::stod functions. 

Here's an example code snippet:

#include <iostream>
#include <string>

int main() {
    std::string numberStr;
    
    std::cout << "Enter a number: ";
    std::getline(std::cin, numberStr);
    
    int numberInt = std::stoi(numberStr);
    float numberFloat = std::stof(numberStr);
    
    std::cout << "Integer: " << numberInt << std::endl;
    std::cout << "Float: " << numberFloat << std::endl;
    
    return 0;
}
 

In this example, std::stoi converts the string to an integer, while std::stof converts the string to a floating-point number.