[streek405]

I was just wondering how to decrement by 5(pre-dec and post-dec). Also, is my user input for the loop correct?

for (int age = input.nextInt(); age <= 65 && age > 0; age-5){
			System.out.println("What do miss about being " + age + " years old: ?");
			String life = input.nextLine();
		}

This post has been edited by streek405: 27 July 2013 - 02:21 PM

[ConciselyVerbose]

age-=5

[Michael26]

Do decrement in the loop

[StrongJoshua]

age-=5

This will subtract 5 from age and assign that value back to age. Also, if you have the first part of the if inside the for loop(age <= 65) you are preventing anyone above the age of 65 to use this program. This may be your design choice, but I just wanted to let you know. Besides that, your code looks good from what you've posted.

Hope this helps

[streek405]

ConciselyVerbose, on 27 July 2013 - 01:48 PM, said:

age-=5

Thanks how would I do it for a pre-decrement of 5?

[StrongJoshua]

streek405, on 27 July 2013 - 02:02 PM, said:

Thanks how would I do it for a pre-decrement of 5?

I don't think I understand the question. When do you want to decrement? Before the for loop or do you mean something else?

[streek405]

StrongJoshua, on 27 July 2013 - 02:06 PM, said:

streek405, on 27 July 2013 - 02:02 PM, said:

Thanks how would I do it for a pre-decrement of 5?

I don't think I understand the question. When do you want to decrement? Before the for loop or do you mean something else?

Here is the current code now:

while (age <= 65 && age > 0){
			System.out.println("What do miss about being " + age + " years old: ?");
			String life = input.nextLine();
			age-=5;
		}

The problem I am having now is that when I run it it prints out, twice before the user can input their answer. When I enter my age (22) it does this:
What do miss about being 22 years old: ?
What do miss about being 17 years old: ?

After the 2nd print its fine. So Im wondering if I should do a predecrement like --age instead of age--, or would that not change the outcome?

[streek405]

StrongJoshua, on 27 July 2013 - 01:50 PM, said:

age-=5

This will subtract 5 from age and assign that value back to age. Also, if you have the first part of the if inside the for loop(age <= 65) you are preventing anyone above the age of 65 to use this program. This may be your design choice, but I just wanted to let you know. Besides that, your code looks good from what you've posted.

Hope this helps />

Thank you. And I already know that, 65 was just some arbitrary number that I chose lol. How would I do a pre-drecement for 5? I tried 5=-age but that didnt work

[Witchking]

You could use

System.out.println("xxx " + (age -= 5) + " yyy");

[Golossos]

I would also like to add (just for the sake of the integrity of input validation in question) that the condition should be between the ages of [5, 65], as follows. This is simply because if the user entered the age "3", the prompt would return a negative age, which is impossible.

The "-=" operation is correct; it is just a shorthand version of updating a value. Think of it being equivalent to:

age = age - 5;

And for your pre-decrement problem, just move the age decrement statement before the System.out prompt. This will update the age and print it correctly.

while (age <= 65 && age >= 5){
			age-=5;
			System.out.println("What do miss about being " + age + " years old: ?");
			String life = input.nextLine();
		}