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cgi and perl programming cgi and perl programming However what do you do when you want to increment not by one but by two? or three? or fifteen? We could of course write i = i + 15 but this happens frequently enough that there's another short hand for the general add and assign operation, +=. We would normally write this as i += 15. Thus if we wanted to count from 0 to 20 by two's we'd write:class CountToTwentyByTwos { public static void main (String args[]) { int i; for (i=0; i <=20; i += 2) { System.out.println(i); } System.

cgi and perl programming out.println("All done!"); } //main ends here}As you might guess there is a corresponding -= operator. If we wanted to count down from twenty to zero by twos we could write:class CountToZeroByTwos { public static void main (String args[]) { int i; for (i=20; i >= 0; i -= 2) { System.out.println(i); } System.

cgi and perl programming out.println("All done!"); }}You should note that we also had to change the initialization and test components of the for loop to count down instead of up.There are also *= and /= operators that multiply and divide by their right hand sides before assigning. In practice you almost never see these because of the speed at which variables making use of them go to either zero or Inf. If you don't believe me consider the following cautionary tale.

cgi and perl programming Many centuries ago in India a very smart man is said to have invented the game of chess. This game greatly amused the king, and he became so enthralled with it that he offered to reward the inventor with anything he wished, up to half his kingdom and his daughter's hand in marriage.Now the inventor of the game of chess was quite intelligent and not a little greedy. Not being satisfied with merely half the kingdom, he asked the king for the following gift:"Mighty King," he said, "I am but a humble man and would not know what to do with half of your kingdom. Let us merely calculate my prize as follows.

cgi and perl programming

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cgi and perl programming