Integer occupies 4 bytes (32 bits)
#include<stdio.h>
int main()
{int a=10;
//00000000000000000000000000001010——原码
//00000000000000000000000000001010——反码
//00000000000000000000000000001010——补码
int b=-10;
//10000000000000000000000000001010——原码
原码——>补码：取反加一
//11111111111111111111111111110101——反码
//11111111111111111111111111110110——补码
return 0;
}According to the positive or negative of a number, the original code is obtained by directly writing its binary representation.
What is stored in memory is two's complement.
The highest bit in binary is the sign bit, 0 means a positive number and 1 means a negative number.
The original code, inverse code, and complement code of positive and unsigned numbers are the same.
The original code, inverse code, and complement code of negative numbers need to be calculated:
The inverse code can be obtained by inverting the sign bit of the original code while the other bits are reversed .
The complement code can be obtained by complement code +1 .