That should work.

ace

union f_to_c {    struct {        char c[4];    }    float num;}float num = 32.5555f;f_to_c convert;convert.num = num;FILE* fp = fopen("output.dat", "wb");fwrite(&num, sizeof(num), 1, fp);fputc(convert.c[0], fp);fputc(convert.c[1], fp);fputc(convert.c[2], fp);fputc(convert.c[3], fp);

should work... definitely verify this though.

Not sure if this works, but is how I'd start playing around. Note that it assumes the number is less then 10.


float fTemp = 1.2345;
int single;

while( fTemp != 0 )
{
single = (int) fTemp; // Hopefully gets the first number. (1)
fTemp %= 10; // Then removes it. (fTemp=0.2345)
fTemp *= 10; // And shuffles the decimal point. (2.345)
// Use single here for whatever you want.
}


Watch for rounding errors, also no idea if modulus (%=) works with floats. Other possibility is to convert it to a string.


char buf[10];
int loopC, digit;
sprintf( buf, "%f", 1.2345 );

for( loopC = 0; buf[loopC] != '\0'; loopC++ ) // Standard char array loop.
{
if( buf[loopC] == '.' ) // You've reached the decimal point, needs different treatment then the numbers.
digit = PERIOD; // Whatever PERIOD is, don't know offhand.
else
digit = buf[loopC]; // Gets the digit as a char.
// digit = buf[loopC] - '0'; This one would turn the char '0' into the int 0, etc.
// Here you'd do whatever you want with digit.
}


I'm sure someone can suggest something with no risk of buffer overflows.

Quote:Original post by ajas95

union f_to_c {    struct {        char c[4];    }    float num;}float num = 32.5555f;f_to_c convert;convert.num = num;FILE* fp = fopen("output.dat", "wb");fwrite(&num, sizeof(num), 1, fp);fputc(convert.c[0], fp);fputc(convert.c[1], fp);fputc(convert.c[2], fp);fputc(convert.c[3], fp);

should work... definitely verify this though.

You have to change it to unsigned char, and it will work.

Changing char to unsigned char is unnecessary unless you are going to convert these into int/long/etc.

2flounder, just curious: why do you need that (I mean, byte representation of float/double)?

Whoa people, slow down there... :)

float the_float = 5.0f;
fwrite(&the_float, sizeof(float), 1, file);

Simple.
Add byteswapping if you need to be crossplatform.

Quote:Original post by Anonymous Poster
Changing char to unsigned char is unnecessary unless you are going to convert these into int/long/etc.

Right. I was testing ajas95's union idea with printf, whereas he was using fputc for output.[embarrass]