Arithmetic operations and expressions

The associativity of operators : The combination direction from right to left becomes “ Right binding ”.

Self increasing 、 Self - subtracting operator ：

 

#include<stdio.h>
void main()
{
	int i = 8;
	printf("%d\n", ++i);
	printf("%d\n",--i);
	printf("%d\n", i++);
	printf("%d\n", i--);
	printf("%d\n", -i++);
	printf("%d\n", -i--);
}

 

#include<stdio.h>
void main()
{
	int i = 5, j = 5, p, q;
	printf("%d\n,%d\n", i++, ++i);
	printf("%d\n,%d\n", ++i, i++);
	p = (i++) + (i++) + (i++);
	q = (++j) + (++j) + (++j);
	printf("%d,%d,%d,%d", p, q, i, j);

}

Execution results ：

6
,7
9
,7
27,24,12,8  Need later understanding

Type conversion

#include<stdio.h>
void main()
{
	int a, b = 322;
	float x, y = 8.8;
	char c1 = 'k', c2;
	a = y;
	x = b;
	a = c1;
	c2 = b;
	printf("%d,%f,%d,%c", a, x, a, c2);

}

Execution results ： Loss accuracy

 

#include<stdio.h>
void main()
{
	
	int a = 2, b = 4, c = 6, x, y;
	y = (x = a + b), (b + c);
	printf("y=%d,x=%d", y, x);
}

Execution results ：y=6,x=6