java mid-term tomorrow! weee!!

[quietRiot]

Midterm tomorrow, please check my code here. I am using quizzes to study, so check my Q and A.

Q:Write a WHILE loop to print out a count from 0 to 100 by increments of two with single number number on each line. The first line should output 0, then 2 and so on until 100 is output. You should declare any variables necessary, but you do not need to place the code in a method or class. The code will receive 2 points for the correct loop type, 2 points for the correct starting position, 2 points for the correct ending position, 2 points for proper incrementation, and 2 points for the proper output statement.

A:

int x=0;
While(x<=100){
x=x+2;
System.out.println(x);
}

Q:Write a FOR loop to print out a countdown from 100 to 0 with a single number on each line. You should declare any variables necessary, but you do not need to place the code in a method or class. The code will receive 2 points for the correct loop type, 2 points for the correct starting position, 2 points for the correct ending position, 2 points for proper decrementation, and 2 points for the proper output statement.

A:

for(int x=100; x>=0; x=x-1)
System.out.println(x);


thanky. (cake, right? gotta start somewhere.)

 

[Minishark]

It looks good to me, except when declaring x in the for loop you accidentally have a subtract instead of equals. I wish the CS classes I'm in now were still this easy.

 

[tim_m]

i'll trade you my take home mid-term essay thingy for my literature class for this....

there's a problem in your first solution regarding when you increment x. it will print out 2, 4, 6, 8, etc. but it's supposed to print 0, 2, 4, 6, etc.

 

[Fryguy8]

for the first one, I'd probably be a jerk:

int x = -2;
while ((x += 2) <= 100)
   System.out.println(x);

or

int x = 0;
do
   System.out.println(x);
while ((x += 2) <= 100)

although this is a do loop

or

int x = 0;
while (x <= 100)
   System.out.println((x += 2));

 

[quietRiot]

It looks good to me, except when declaring x in the for loop you accidentally have a subtract instead of equals. I wish the CS classes I'm in now were still this easy.

gotcha, yea, i see that. haha, yea, i knew this would be cake.

 

[quietRiot]

i'll trade you my take home mid-term essay thingy for my literature class for this....

there's a problem in your first solution regarding when you increment x. it will print out 2, 4, 6, 8, etc. but it's supposed to print 0, 2, 4, 6, etc.

i should then start with x=-2 i guess, then. thanks a lot.

ahh i see, because it will run the loop first before the first printout, so it will increment before it prints the first x.

 

[MovieMan80]

For the while loop you just need to move the println statement to be above the x+=2 line.

int x = 0
while(x <= 100){
   System.out.println(x);
   x = x + 2;
}