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[Mini]

If you posted your code then we'd be able to help a lot more effectively. Without seeing your code, I can say that it's possible that variable has fallen out of scope when you're trying to use it, maybe.

[Sirus]

Spoiler (click to show/hide)

Code: [Select]

void patternThree(int option, int size, char symb)
{
//Local variables. i represents characters, j represents integers. lines measures the proper height of the pattern
int lines, i, j;
i = size;
j = 0;
lines = 1;

while (lines != size)
{
//i loop
for (int check = i; check > 0; check--)
printf("%c", symb);

//j loop
for (int check = j; check > 0; check--)
printf("%d", size);

printf("/n");
i--;
j++;
lines++;
}
}

I'm also getting errors about missing semicolons and stuff. This is not the first time for loops have utterly failed on this computer...

Oh, and the pattern is supposed to look something like this:

Code: [Select]

@@@@@
@@@@5
@@@55
@@555
@5555

[alexandertnt]

Yes, it is very useful when you are creating a custom collection that you want to be able to optimize at runtime for the efficiency of the task you are performing. You would not want to be stuck using an class that extends LinkedList when you need random read for a specific task and you wouldn't want to be stuck with an array list if another task involved a lot of random inserts and deletes that require shifting a lot of elements. This way you can have a custom collection that uses the collection optimal to whatever your current task is without having multiple different types of collections.

Oops, I meant programming overhead. But the performance too I suppose.

snip

You cannot declare variables in the for loops (the check variable) in C89, only in C99. Try to compile with -std=c99, or declare check outside of the loop like this:

Code: (compiles) [Select]

void patternThree(int option, int size, char symb)
{
//Local variables. i represents characters, j represents integers. lines measures the proper height of the pattern
int lines, i, j;
i = size;
j = 0;
lines = 1;

while(lines != size)
{
//i loop
int check;
for(check = i; check > 0; check--)
printf("%c", symb);

//j loop
for (check = j; check > 0; check--)
printf("%d", size);

printf("/n");
i--;
j++;
lines++;
}
}


[Sirus]

I tried that too. No matter where I declare check, the program acts as if it doesn't exist. It doesn't make any sense.

EDIT: And now while loops aren't working either. My mainstay before I started getting a handle on for loops, and they fail. Armok, strike me down where I sit.

[Skyrunner]

What program are you using to program in? O_o

Also, go look up a tutorial Computer classes are so slow.

[Sirus]

Visual Studio 2010. And online tutorials won't give me credits towards a degree.

I managed to mostly get it working eventually, but I had to turn it in unfinished to get it in in time.

[Skyrunner]

I understood your post as meaning that you're just waiting for other loops that aren't while loops o_O

[Dutchling]

I'm not sure how to do the following :/

"Can  you design an algorithm that performs only 3n/2 comparisons to find the smallest and largest numbers in the list?"

2n is easy, but obviously not correct.

[MagmaMcFry]

Always read two numbers at a time. Compare them to each other. Only the larger can be the largest number, and only the smaller can be the smallest.

[RedKing]

* RedKing reads the answers given for Java question...

o_0
O_o
>_<
x_x
;_;

Question withdrawn. I'll just blame North Korea or something. >_>

[Dutchling]

Always read two numbers at a time. Compare them to each other. Only the larger can be the largest number, and only the smaller can be the smallest.

Thanks

[Nadaka]

* RedKing reads the answers given for Java question...

o_0
O_o
>_<
x_x
;_;

Question withdrawn. I'll just blame North Korea or something. >_>

Well java obviously isn't the best language of you are going to run a half second task once, due to the overhead of starting the VM. You could use python and get the answer in 3 or 4 seconds.

But if you had a million half second tasks, java can do them in about half a million seconds, less if you they can be done in parallel and you have multiple cpu's. That same python code would take  3 or 4 million seconds.

[MadocComadrin]

Anyone see today's XKCD?

[Dutchling]

Yes. Please explain. Me no understando.

[MagmaMcFry]

Yes. Please explain. Me no understando.

Well, it's two people taking turns throwing a ball at themselves (not at each other, mind you).

EDIT: Fix'd. Now they properly throw balls at each other.

Code: [Select]

public class Person {
public Ball ball;

public Person(Ball ball) {
this.ball = ball;
}

public void aim() throws Ball {
if (ball == null) return;
Ball temp = ball;
ball = null;
throw temp;
}

public void wave(Person target) {
try {
target.aim();
} catch(Ball ball) {
this.ball = ball;
waitFor(target);
}
}

public void waitFor(Person target) {
target.wave(this);
}

public static void main(String[] args) {
Person parent = new Person(new Ball());
Person child = new Person(null);
child.wave(parent);
}

public static class Ball extends Throwable {
}
}