C language inverse code calculation questions and answers

Answer 1

The following are some examples of complement calculations in C:

** 1. Counting the complement of an integral **
1. ** Counting Positive Numbers **
- For example, for a positive number {+1}, if it is expressed in 8-bit binaries, the original code is {[0000001]}. Since the complement of the positive number is the same as the original code, the complement is {[0000001]}.
2. ** Counting Negative Numbers **
- For example, if the complement of the negative number is calculated, it is represented by an 8-bit system. The original code is [10000001]. The complement of a negative number is the inverse of the original code bit by bit (the sign bit does not change), so the complement of the negative number is [1111110].
- Another example is to calculate the complement of the code, first convert the code to the 8-bit original code. (67= 64 + 2+1), its 8-bit original code is [11000011], then the complement of [-67] is [10111100](the sign bit is unchanged, the rest of the bits are inverted).

** 2. The complement of floating-point numbers in C language is more complicated **
- In the C language, for floating-point numbers, such as <-123.56>, its storage in memory followed the standard of the IMEE754 standard. It was not simply handled with the concepts of original code, complement code, and complement code. If you forcefully convert it to an signed integral type (this is a special way of processing, not the true meaning of the complement calculation of floating-point numbers), for example:
```c
#include "stdio.h"
void main() {
unsigned float a=-125.56;
printf("%u",a);
}
```
The output here wasn't based on the traditional concept of the complement code, but the result of the bit pattern of the floating-point number in the memory interpreted according to the signed number. It was fundamentally different from the complement code concept of the floating-point number. Therefore, for floating-point numbers, they generally did not follow the concept of original code, complement code, and complement code to deal with their representation.
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