Integer to String

This is a discussion on Integer to String within the C Programming forums, part of the General Programming Boards category; Hi all, We have atoi() to convert a string into an integer. How about the other way round? Can anyone ...

  1. #1
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    Integer to String

    Hi all,

    We have atoi() to convert a string into an integer. How about the other way round?
    Can anyone tell me how to convert an integer into a string? Thank you..

  2. #2
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    Code:
    int num = 12345;
    char string[6];
    snprintf(string, 6 ,"%d", num);

  3. #3
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    yes, it's
    Code:
    char buffer[20];
    int i = 1234;
    itoa(buffer, i, 10) // 10 is the radix, base 10. try base 2 for binary representation
    //try switching 'buffer' and 'i' around if that doesn't compile. i forget the order of parameters
    i seem to have GCC 3.3.4
    But how do i start it?
    I dont have a menu for it or anything.

  4. #4
    ATH0 quzah's Avatar
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    Next time try providing a portable answer. Your answer is a GNU extension specific solution. Try the standard sprintf instead.
    Code:
    char buf[ BUFSIZ ] = {0};
    
    sprintf( buf, "%d", 12345 );
    On an aside, this is a very common question that, if not in the faq already, certainly gets asked on the forums all the time. Therefore, for future reference, try searching the forums (as the Announcements suggest) for answers first.

    Quzah.
    Hope is the first step on the road to disappointment.

  5. #5
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    Quote Originally Posted by quzah
    Try the standard sprintf instead.
    Didn't know that snprint wasn't portable. I also figured that it's better to use to prevent a buffer overflow.

  6. #6
    ATH0 quzah's Avatar
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    Quote Originally Posted by l0cke
    Didn't know that snprint wasn't portable. I also figured that it's better to use to prevent a buffer overflow.
    Well, to quote the man page:

    CONFORMING TO
    These are GNU extensions.
    Yes, it's better for the prevention of buffer overflows, but it's not a standard function. Just like all of the strn* functions aren't standard.

    Quzah.
    Hope is the first step on the road to disappointment.

  7. #7
    Just Lurking Dave_Sinkula's Avatar
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    Quote Originally Posted by quzah
    Just like all of the strn* functions aren't standard.
    I believe strncpy, strncat, and strncmp have been standard for a while; snprintf is standard in C99.
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

  8. #8
    ATH0 quzah's Avatar
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    *looks* Well so they are. I guess it's time for rt to update their man pages (my quick point of reference usually).

    Quzah.
    Hope is the first step on the road to disappointment.

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