C++ Program For Double to String Conversion Last Updated : 26 Jul, 2022 Summarize Comments Improve Suggest changes Share Like Article Like Report Here, we will build a C++ program for double to string conversion using various methods i.e. Using to_stringUsing stringstreamUsing sprintfUsing lexical_cast We will keep the same input in all the mentioned approaches and get an output accordingly. Input: n = 456321.7651234 Output: string: 456321.7651234 1. Using to_string In C++, use std::to string to convert a double to a string. The required parameter is a double value, and a string object containing the double value as a sequence of characters is returned. C++ // C++ Program to demonstrate Double to // String Conversion using to_string #include <iostream> #include <string.h> using namespace std; int main() { double n = 456321.7651234; string str = to_string(n); cout << "String is: " << str; return 0; } OutputString is: 456321.7651232. Using stringstream A double can also be converted into a string in C++ in different ways depending on our requirements using ostringstream. C++ // C++ Program to demonstrate Double to // String Conversion using string stream #include <iostream> #include <sstream> #include <string> using namespace std; int main() { ostringstream s; double n = 2332.43; s << n; string str = s.str(); cout << "String is:" << str; return 0; } OutputString is:2332.433. Using sprintf By specifying the precision in sprintf, we can convert double to string or character array with custom precision. We can use sprintf to add extra text (as required) to the string at the same time. C++ // C++ Program to demonstrate Double to // String Conversion using sprintf #include <cstring> #include <iostream> #include <string> #define Max_Digits 10 using namespace std; int main() { double N = 1243.3456; char str[Max_Digits + sizeof(char)]; std::sprintf(str, "%f", N); std::printf("string is: %s \n", str); return 0; } Outputstring is: 1243.345600 4. Using lexical_cast The lexical cast is one of the best ways to convert double to string. C++ // C++ Program to demonstrate Double to // String Conversion using lexical_cast #include <boost/lexical_cast.hpp> #include <iostream> #include <string> using namespace std; int main() { double n = 432.12; string str = boost::lexical_cast<string>(n); cout << "string is:" << str; return 0; } Outputstring is:432.12 Comment More infoAdvertise with us Next Article Class Diagram | Unified Modeling Language (UML) K ksrikanth0498 Follow Improve Article Tags : C++ Programs C++ C++ Conversion Programs Practice Tags : CPP Similar Reads C++ Programming Language C++ is a computer programming language developed by Bjarne Stroustrup as an extension of the C language. It is known for is fast speed, low level memory management and is often taught as first programming language. 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