How to convert integer to string in C

Question

I tried this example      itoa example     include  lt stdio h gt   include  lt stdlib h gt   int main          int i      char buffer  33       printf   Enter a number          scanf    d   amp i       itoa  i buffer 10       printf   decimal   s n  buffer       itoa  i buffer 16       printf   hexadecimal   s n  buffer       itoa  i buffer 2       printf   binary   s n  buffer       return 0      but the example there doesn t work  it says the function itoa doesn t exist

User · Accepted Answer

Use sprintf     int someInt   368  char str 12   sprintf str    d   someInt     All numbers that are representable by int will fit in a 12-char-array without overflow  unless your compiler is somehow using more than 32-bits for int  When using numbers with greater bitsize  e g  long with most 64-bit compilers  you need to increase the array size   at least 21 characters for 64-bit types

User · Answer

Making your own itoa is also easy  try this    char  itoa int i  char b         char const digit      0123456789       char  p   b      if i lt 0            p      -           i    -1            int shifter   i      do    Move to where representation ends           p          shifter   shifter 10       while shifter        p     0       do    Move back  inserting digits as u go          --p   digit i 10           i   i 10       while i       return b      or use the standard sprintf   function

User · Answer

That s because itoa isn t a standard function  Try snprintf instead   char str LEN   snprintf str  LEN    d   42

[c] How to convert integer to string in C?

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