Self-increment and self-decrement in C language

Let’s talk about self-increment first. Self-increment is divided into front self-increment and back self-increment
Front self-increment: ++i
Back self-increment: i++

#include<stdio.h>
int main()
{
    
    
	int i,j,k,m;
	i = j = 6;
	
	k = ++i;
	m = j++;
	
    printf("i = %d，j = %d，k = %d，m = %d\n",i,j,k,m);
    return 0;
}

The output is: i = 7, j = 7, k = 7, m = 6

• The value of the self-increasing overall expression before is the value after i is added by 1. My personal understanding is that i first adds 1 to itself and then displays it. Assign to variablek
• The value of the auto-incrementing overall expression after is the value before i is added by 1. My personal understanding is that it first presents its original value and assigns it to variable m, iAdd 1 again
• The front auto-increment and the back auto-increment will eventually increase the value of i by 1

In the same way, the former self-decrement and the rear self-decrement in self-decrement can be understood as described above.

Replenish

1. Using auto-increment and self-decrement can make the code more concise, and more importantly, the operation of the two modes of auto-increment and self-decrementi=i+1 and i+=1 Much faster. When running the two modes i=i+1 and i+=1, the computer first takes out the data in the memory and uses in the memory, and and are directly in the cpu Processed in the register. iii++++i

2. When using auto-increment and auto-decrement, it is best to make it a separate statement and try to avoid using it as part of a complete compound statement.