Converting float to char

Question

How can I convert a float value to char  in C language

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Long after accept answer  Use sprintf    or related functions  as many others have answers suggested  but use a better format specifier  Using  quot    e quot   code solves various issues   The maximum buffer size needed is far more reasonable  like 18 for float  see below   With  quot  f quot   sprintf buf   quot  f quot   FLT MAX   could need 47   sprintf buf   quot  f quot   DBL MAX   may need 317   Using  quot    quot  allows code to define the number of decimal places needed to distinguish a string version of float x and it next highest float   For deatils  see Printf width specifier to maintain precision of floating-point value  Using  quot  e quot  allows code to distinguish small floats from each other rather than all printing  quot 0 000000 quot  which is the result when  x   lt  0 0000005    Example usage  include  lt float h gt   define FLT STRING SIZE  1 1 1  FLT DECIMAL DIG-1  1 1  4    1                           - d    dddddddd           e - dddd  0  char buf FLT STRING SIZE   sprintf buf   quot    e quot   FLT DECIMAL DIG-1  some float    Ideas  IMO  better to use 2x buffer size for scratch pads like buf FLT STRING SIZE 2   For added robustness  use snprintf     As a 2nd alterative consider  quot    g quot    It is like  quot  f quot  for values exponentially  near 1 0  and like  quot  e quot  for others

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char  str NULL  int len   asprintf  amp str    g   float var   if  len    -1    fprintf stderr   Error converting float   m n    else   printf  float is  s n   str   free str

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char array 10   snprintf array  sizeof array     f   3 333333

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In Arduino     temporarily holds data from vals char charVal 10                      4 is mininum width  3 is precision  float value is copied onto buff dtostrf 123 234  4  3  charVal    monitor print  charVal      monitor println charVal

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char array 10   sprintf array    f   3 123     sprintf   from MSDN

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typedef union      float a      char b 4     my union t    You can access to float data value byte by byte and send it through 8-bit output buffer  e g  USART  without casting

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char buffer 64   int ret   snprintf buffer  sizeof buffer    f   myFloat    if  ret  lt  0        return EXIT FAILURE    if  ret  gt   sizeof buffer           Result was truncated - resize the buffer and retry      That will store the string representation of myFloat in myCharPointer  Make sure that the string is large enough to hold it  though   snprintf is a better option than sprintf as it guarantees it will never write past the size of the buffer you supply in argument 2

[c] Converting float to char*

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