Convert IEEE float hex to decimal?

Question

IF I have a IEEE float hex 42F6E979, how do I convert it to decimal? I believe the decimal representation is = 123.456001

Answer 1

I'll do this in C, because you haven't provided a language.

char hex[];
int *ptr;
for(int i = 0; i < 8; ++i)
{
   &ptr += toNumber(hex[i]) << (i * 4);
}

float *value = (float*)ptr;

I'll leave it up to the OP to write the toNumber function.