Why Blockchains Exclude Floating Point at the Architecture Level

I ran the same C program on three machines. Same code. Same inputs. Three different answers. Here's exactly why The Experiment #include int main () { long double x = 0 . 1L + 0 . 2L ; printf ( "%.20Lf \n " , x ); unsigned char * p = ( unsigned char * ) & x ; for ( int i = 0 ; i sizeof ( x ); i ++ ) printf ( "%02x " , p [ i ]); printf ( " \n " ); return 0 ; } Three machines. All running the same binary-equivalent logic: Machine OS Architecture A Linux AMD x86_64 B Linux Raspberry Pi ARMv8 C m