float to ascii conversion

[momar128]

float to ascii

I need to convert floating point number into ASCII Character in C language.
Can anyone illustrate me with simple example.

 

[artem]

float to ascii conversion in c

- get the format those are stored (your C compiler documentation must tell that )in your memory
- get bytes from memory according to format above
and convert them byte by byte to the ascii acccording
to byte meaning .

 

[C-Man]

float to ascii in c

This is highly machine dependant, you should be able to what you need if your compiler has the sprintf library function which acts like printf but puts the result into a buffer (memory) from where you can extract the ascii representation of your float.

I also included a routine I found on the net, but as said before this is machine dependant!!!

If possible use sprintf.

hope this helps

 

[nebisman]

ieee754 ascii conversion

If you use the IEEE 754 (most usual) norm for float remember:


bit 31 sign
bit 23-30 exponent with excess to 127 (0 es 127)
bit 0 -22 mantissa

then you can eloborate a function which is composed union mixed with estructure for return these fields and then traduce then to ASCII. This union return the fields in BYTES for trasmision over a RS232 channel.

union {
  double num_float;
  long int num_longint;
  int num_int;
  struct dividir{
  char byte3;
  char byte2;
  char byte1;
  char byte0;
  }bytes;
}number;


and access to fields for this example:



void
tx_float (double num_tx){
numero.num_float = num_tx;
putch(numero.bytes.byte3);
putch(numero.bytes.byte2);
putch(numero.bytes.byte1);
putch(numero.bytes.byte0);
}

then only set the fields for return the sign, exponent,mantissa, if I understand your problem, and with simple function convert it to ASCII code ex. -1.25 e 24. (sign ,mantissa ,exponen)

 

[amir81]

you can use thses functions:

AnsiString __fastcall FloatToStr(Extended Value);

AnsiString __fastcall FloatToStrF(Extended Value, TFloatFormat Format, int Precision, int Digits);

int __fastcall FloatToText(char * Buffer, const void *Value, TFloatValue ValueType, TFloatFormat Format, int Precision, int Digits);

int __fastcall FloatToTextFmt(char * Buffer, const void *Value, TFloatValue ValueType, char * Format);