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PHP implements factorial operation small code

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2016-07-23 08:54:561339browse
  1. $sum = 1;
  2. $num = 7;
  3. if( $num>0 ){
  4. for($i=$num;$i>0;$i--){
  5. $sum*=$i;
  6. }
  7. echo $sum;
  8. }elseif( $num<0 ){
  9. //Note here is ++, negative numbers closer to 0 are ++
  10. for($i=$num; $i<0;$i++){
  11. $sum*=$i;
  12. }
  13. echo $sum;
  14. }else{
  15. echo "0";
  16. }
  17. ?>
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