A Crash Course in C - copyright 1995 by Anand Mehta - Basic Operators

Examples of the Increment and Decrement Operators 

/**  examples of the increment and decrement operators  **/
int main(void)
{
  int x,y;

  x=5;
    /**  prefix increment  **/
  y = ++x;                             
  printf("++x:  x=%d, y=%d\n", x, y);

  x=5;
    /**  postfix increment  **/
  y = x++;                             
  printf("x++:  x=%d, y=%d\n", x, y);

  x=5;
    /**  prefix decrement  **/
  y = --x;                             
  printf("--x:  x=%d, y=%d\n", x, y);

  x=5;
    /**  postfix decrement  **/
  y = x--;                             
  printf("x--:  x=%d, y=%d\n", x, y);

  return 0;
}

Output: 

++x:  x=6, y=6
x++:  x=6, y=5
--x:  x=4, y=4
x--:  x=4, y=5
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