Convert String to Double
Convert String to Double in C++ (6 Programs)
BeginnerTopic: String Conversion Programs
C++ Convert String to Double Program
This program helps you to learn the fundamental structure and syntax of C++ programming.
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
int main() {
string str = "123.456";
// Method 1: Using stod()
double num1 = stod(str);
// Method 2: Using stringstream
stringstream ss(str);
double num2;
ss >> num2;
cout << "String: " << str << endl;
cout << "Double (method 1): " << num1 << endl;
cout << "Double (method 2): " << num2 << endl;
return 0;
}Output
String: 123.456 Double (method 1): 123.456 Double (method 2): 123.456
Understanding Convert String to Double
This program demonstrates 6 different methods to convert a string to a double: using stod(), stringstream, atof(), sscanf(), strtod(), and manual conversion.
Note: To write and run C++ programs, you need to set up the local environment on your computer. Refer to the complete article Setting up C++ Development Environment. If you do not want to set up the local environment on your computer, you can also use online IDE to write and run your C++ programs.