Programming Forums - Int to String

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- - Int to String (http://www.programmingforums.org/showthread.php?t=10560)

crawforddavid2006

Jun 28th, 2006 5:54 PM

Int to String

How do I turn an in into a string in C++?

Klarre

Jun 28th, 2006 6:09 PM

Try this function to convert from int to std::string.

#include <sstream>



template <class T>

std::string stringConverter(const T &value)

{

        std::stringstream stream;

        stream << value;



        return stream.str();

}

/Klarre

titaniumdecoy

Jun 28th, 2006 7:17 PM

You can use atoi(string s) if it is available on your system.

DaWei

Jun 28th, 2006 7:18 PM

Klarre has a good answer, but consider this: suppose you have the absolute value of 10 (decimal, the average number of fingers on two hands, assuming you don't mess around carelessly with a table saw). What is a string representing that? "10"? "Ten"? "diez"? "umpty-zillion"? You are in an area of (hopefully, somewhat cooperative) representation. There is no hard and fast answer.

Seif	Jun 28th, 2006 8:02 PM

Quote:

Originally Posted by DaWei

the average number of fingers on two hands.

That the average number of fingers on mutant hands? :confused:

mrynit

Jun 28th, 2006 8:30 PM

make sure its in the ascii range, or what ever system your using. look for the bounds.

Jessehk

Jun 28th, 2006 9:08 PM

Just to be helpful (and to learn it myself), I though I'd devise the reverse function. :)

#include <string>

#include <sstream>

#include <stdexcept>

#include <iostream>



class ParseError : public std::invalid_argument {

    public:

        ParseError(const std::string &msg)

            : std::invalid_argument(msg) {

        }

};



template<typename T>

T parse_string(const std::string &input) throw(ParseError) {

    std::istringstream source(input);



    T result;

    if(!(source >> result))

        throw ParseError("Unable to retrieve data from input string.");

    else

        return result;

}



int main() {

    try {

        int n1 = parse_string<int>("3412");

        std::cout << n1 << std::endl;



        float n2 = parse_string<float>("3.14159");

        std::cout << n2 << std::endl;



        //should raise ParseError

        int n3 = parse_string<int>("abc");

        std::cout << n3 << std::endl;



    } catch(ParseError &pe) {

        std::cout << pe.what() << std::endl;

    }

}

crawforddavid2006

Jun 28th, 2006 10:31 PM

Well what i want is a loop that will turn the index number of that for loop into the string... ex. 10 = "10" not "Ten"

Prm753

Jun 28th, 2006 10:54 PM

Slightly-off-topic alert: This is not 100% C++, but it is an intresting function that I came across yesterday:

#include <iostream> 

#include <stdio.h>

int main() 

{

    char string[80];

    int number = 10;

    sprintf(string, // Char to which you want to put data in,

    "%i", // your string data, with the int specifed,

    number); // and of course, your int.

    std::cout << string << std::endl; 

    std::cin.get();

    return 0;

}

I wish it was that easy in C++.

angry_asian

Jun 28th, 2006 11:10 PM

is that C prm753?

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