Oct 18, 2011

C Program to Demonstrate the increment and decrement operators.

C program which demonstrates about the increment and decrement operators. Increment operator ++ adds 1 to its operand and Decrement operator -- subtracts 1 from its operand. These operators may be used either as a prefix operator or post-fix operator. Read more about C Programming Language .
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main()
{

 /*
  * ++i -> i incremented before i is used.
  * --i -> i decremented before i is used.
  * j++ -> j is incremented AFTER j has been used. 
  * j-- -> j is decremented AFTER j has been used. 
  */

 int i=1,j=1;

 puts("\tDemo 1");
 printf("\t%d %d\n",++i, j++);   /* O/P  2 1 */
 printf("\t%d %d\n",i, j);    /* O/P  2 2 */

 i=1;j=1;

 puts("\n\tDemo 2");
 printf("\t%d \n",i=j++);    /* O/P  1 */
 printf("\t%d \n",i=++j);    /* O/P  3 */



 i = 0; j = 0;

 puts("\n\tDemo 3");
 if ( (i++ == 1) && (j++ == 1)) puts("Some text");

 /* Will i and j get incremented? The answer is NO! Because 
  * the expression in the left of '&&' resolves to false the 
  * compiler does NOT execute the expression on the right and 
  * so 'j' does not get executed!!!!! */


 printf("\t%d %d\n",i, j);    /* O/P 1 0 */

}
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