Mathematical operators

Mathematical expressions	Expressed in the C	Process
. X or nothing	*	multiplication
Mode	%	Modular quotient
/	/	Quotient
+1	++	Unary increment
-1	--	Unary decrement
+	+	Sum
-	-	Difference

The expression of meaning may change for operator location. The right or left is important.

header	header
A++ (postincrement)	Firstly use A, than add 1 to the number.
++A ( preincrement )	Firstly add 1 to the A, after use number.
A -- ( postdecrement )	Firstly use A, than subtract 1 to the number.
-- A ( predecrement )	Firstly subtract 1 to the A, after use number.

An example of a difference in meaning of change unory operator location; For example, should it be : a=4, b=5

header	header	header	header	header	header
c=a++ *b	c=a*b a=a+1	c=4*5=20 a=4+1=5	a=5	b=5	c=20
c=++a–b	a=a+1 c=a - b	a=4+1=5 c=5 - 5=0	a=5	b=5	c=0
c= -- a + b --	a=a+1 c=a+b b=b - 1	a=4 - 1=3 c=3+5=8 b=5 - 1=4	a=3	b=4	c=8

+/- Click and see the code that is about the article.

/* source : freelearncprogramming.blogspot.com */
#include <stdio.h>
main ()
{
int a,b,c;
float c1;
a=4;
b=5;
c=a++*b ;
c1=++a-b ;
printf ("c = %d \n",c);
printf ("c1 = %d \n",c1);
return 0;
}