how to convert from int to char

Question

The only way I know is    include  lt sstream gt   include  lt string h gt  using namespace std   int main       int number 33    stringstream strs    strs  lt  lt  number    string temp str   strs str      char  char type    char   temp str c str        But is there any method with less typing

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In C  17  use std  to chars as   std  array lt char  10 gt  str  std  to chars str data    str data     str size    42    In C  11  use std  to string as   std  string s   std  to string number   char const  pchar   s c str       use char const  as target type  And in C  03  what you re doing is just fine  except use const as   char const  pchar   temp str c str      dont use cast

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This might be a bit late  but i also had the same issue  Converting to char was addressed in C  17 with the  charconv  library   https   en cppreference com w cpp utility to chars

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You can use boost   include  lt boost lexical cast hpp gt  string s   boost  lexical cast lt string gt   number

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Converting our integer value to std  string so we can know how long  how long number of digits   Then we creating char array length of string letter size  1  so we can copy our value to string then char array   include  lt string gt   char  intToStr int data        std  string strData   std  to string data        char  temp   new char strData length     1       strcpy temp  strData c str         return temp

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I would not typecast away the const in the last line since it is there for a reason  If you can t live with a const char  then you better copy the char array like   char  char type   new char temp str length     strcpy char type  temp str c str

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See this answer https   stackoverflow com a 23010605 2760919  For your case  just change the type in snprintf from long    ld   to int    n

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C-style solution could be to use itoa  but better way is to print this number into string by using sprintf   snprintf  Check this question  How to convert an integer to a string portably   Note that itoa function is not defined in ANSI-C and is not part of C    but is supported by some compilers  It s a non-standard function  thus you should avoid using it  Check this question too  Alternative to itoa   for converting integer to string C     Also note that writing C-style code while programming in C   is considered bad practice and sometimes referred as  ghastly style   Do you really want to convert it into C-style char  string

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You also can use casting   example   string s  int value   3  s push back  char   0    value

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I think you can use a sprintf    int number   33  char  numberstring    sizeof number    CHAR BIT    2  3   2   sprintf numberstring    d   number

User · Answer

Alright   firstly I needed something that did what this question is asking  but I needed it FAST  Unfortunately the  better  way is nearly 600 lines of code    Pardon the name of it that doesn t have anything to do with what it s doing  Proper name was Integer64ToCharArray int64 t value    https   github com JeremyDX All-Language-Testing-Code blob master C 2B 2B 20Examples IntegerToCharArrayTesting cpp  Feel free to try cleaning that code up without hindering performance   Input  Any signed 64 bit value from min to max range   Example   std  cout  lt  lt   Test     lt  lt  AddDynamicallyToBuffer LLONG MAX   lt  lt    n   std  cout  lt  lt   Test     lt  lt  AddDynamicallyToBuffer LLONG MIN   lt  lt    n     Output   Test  9223372036854775807 Test  -9223372036854775808   Original Speed Tests   Integer64ToCharArray      Best case 1 digit value      Loops  100 000 000  Time Spent  1 381 Milli   Time Per Loop 13 Nano    Worse Case 20 Digit Value      Loops  100 000 000  Time Spent  22 656 Milli   Time Per Loop 226 Nano   New Design Speed Tests   AddDynamicallyToBuffer      Best case 1 digit value      Loops  100 000 000  Time Spent  427 Milli   Time Per Loop 4 Nano    32 Bit Worst Case - 11 digit Value      Loops  100 000 000  Time Spent  1 991 Milli   Time Per Loop 19 Nano    Negative 1 Trillion Worst Case - 14 digit Value      Loops  100 000 000  Time Spent  5 681 Milli   Time Per Loop 56 Nano    64 Bit Worse Case - 20 Digit Value      Loops  100 000 000  Time Spent  13 148 Milli   Time Per Loop 131 Nano    How It Works   We Perform a Divide and Conquer technique and once we now the maximum length of the string we simply set each character value individually  As shown in above speed tests the larger lengths get big performance penalties  but it s still far faster then the original loop method and no code has actually changed between the two methods other then looping is no longer in use   In my usage hence the name I return the offset instead and I don t edit a buffer of char arrays rather I begin updating vertex data and the function has an additional parameter for offset so it s not initialized to -1

[c++] how to convert from int to char*?

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