i just see this file " ieeefloat.c " driver of ccs

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i just see this file " ieeefloat.c " driver of ccs. What is it?
and how to solve problem about value 15.000(True value) but when printf is 14.9999.
Please explain about it. Thank you very much. And sorry about my poor english.

int32 f_PICtoIEEE(float f)
{
int16 c[2];

memcpy((int8*)c , ((int8*)&f)+3, 1);
memcpy((int8*)c+1, ((int8*)&f)+2, 1);
memcpy((int8*)c+2, ((int8*)&f)+1, 1);
memcpy((int8*)c+3, ((int8*)&f) , 1);
c[1] = ((c[1] >> 1) & 0x7F80) + (c[1] & 0x7F) + ((c[1] & 0x80) << 8);
return ((int32)c[1] << 16) | c[0];
}


float f_IEEEtoPIC(int32 f)
{
float ret;
int16 temp;

memcpy(&temp, ((int8*)&f)+2, 2);
temp = ((temp << 1) & 0xFF00) + (temp & 0xFF);

if(bit_test(f, 31)) // Test the sign bit
temp |= 0x0080;
else
temp &= 0xFF7F;

memcpy(((int8*)&ret)+3, ((int8*)&f) , 1);
memcpy(((int8*)&ret)+2, ((int8*)&f)+1 , 1);
memcpy(((int8*)&ret)+1, ((int8*)&temp) , 1);
memcpy(((int8*)&ret) , ((int8*)&temp)+1, 1);

return ret;
}

[Ttelmah]