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-- Decrement operator decreases the integer A-- = 9
value by one.

Example
Try the following example to understand all the arithmetic operators available in C:
When you compile and execute the above program, it produces the following result:

#include <stdio.h>

main()
{

int a = 21;
int b = 10;

int c ;

c = a + b;
printf("Line 1 - Value of c is %d\n", c );

c = a - b;
printf("Line 2 - Value of c is %d\n", c );

c = a * b;
printf("Line 3 - Value of c is %d\n", c );

c = a / b;
printf("Line 4 - Value of c is %d\n", c );

c = a % b;
printf("Line 5 - Value of c is %d\n", c );

c = a++;
printf("Line 6 - Value of c is %d\n", c );

c = a--;
printf("Line 7 - Value of c is %d\n", c );

}

Line 1 - Value of c is 31

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