13 assert(
ieee754man64(123.456) == 0b1110110111010010111100011010100111111011111001110111);
15 assert(
ieee754man64(555.555) == 0b0001010111000111000010100011110101110000101000111101);
uint32_t ieee754man32(float x)
uint64_t ieee754man64(double x)
uint8_t ieee754exp32(float x)
uint16_t ieee754exp64(double x)