basic nested-for loop

[rrcn]

I am having a little trouble creating an algorithm which prints to the screen an empty 5 X 5 square. I have already created one that prints to the screen a filled square:


FOR I <-- 1 TO 5
For J <-- 1 TO 5
OUTPUT '*', more
ENDFOR
OUTPUT
ENDFOR


The result should look like this:

*****
* *
* *
* *
*****


Thanks for your time and help. :)
Peace.

[suny]

you could set up a if statement in the second for loop checking for the value of I == 1 or I == 5 then you do the current output,

the else statement is where you could set up an additional
if statement to check if J is 1 or 5 and print *
else print the whitespace.

(hope that is clear enough)

[rrcn]

I dont exactly understand. Maybe if you explain what you would do line by line if that isnt any trouble.

Thanks again suny.

[nothing]

This is how I would to it in C++

#include <iostream>
using std::cout;
using std::endl;

#include <iomanip>
using std::setw;

int main()
{
int size = 5;

for( int x = 0; x < size; x++ )
cout << "*";

cout << endl;

for( int y = 2; y < size; y++ )
cout << "*" << setw( size ) << "*\n";

for( int z = 0; z < size; z++ )
cout << "*";

cout << endl;

return 0;
}


I guess the only thing you won't understand in this program is the setw function. This function prints whitespaces on the screen.


cout << "*" << setw( size ) << "*\n";


This line prints an asterisk, then it prints five whitespaces and then it prints another asterisk followed by a new line. I hope this helps :t

[rrcn]

Now I see. Alright, thanks for your help.

[rrcn]

how would you apply setw( size ) to assembly code?

[suny]

for(i=0; i<5; i++)
{
for(j=0; j<5; j++)
{
if( i == 0 || i == 4)
{
cout<<"*";
}
else // i is 1 or 2 or 3
{
if(j == 0 || j== 4)
{
cout<<"*";
}
else
{
cout<<" ";
}
}
cout<<endl;
}
}


i was basically stating this

[rrcn]

I now completely understand what you were saying suny. Thank you very much for your time.

Peace

[rrcn]

by the way suny, i ran your code but something is wrong with it. i'm trying to figure it out. check it out...

[nothing]

rrcn, the piece of code suny posted won't compile because it is not complete. He just wanted to help you understand what he meant in his previous post.

[rrcn]

i didn't say it wasn't compiling. i was saying that there is some logical error in it. of course it doesn't compile, it's incomplete...i program in c++ too.

anyway, that's ok. thank you both suny and nothing for your help today.

[nothing]

Ooops. My mistake. I thought you didn't know C/C++ :rolleyes:

[DocEvi1]

in pseudo code you want (java comments)

for i == 1 to 5 do //outside loop, downwards
for j == 1 to 5 do //inside loop, across
if((i == 1 or 5) or (j == 1 or 5)) //print horizontal ***'s or print * *
print *
else if ((i <> 1 or 5 ) and (j <> 1 or 5))
print " "
od
od


what machine code are you wanting to produce it in? it looks a bit like BASIC used to look like, but I'm not sure.

[rrcn]

Thanks docevi1 for the psudocode. This language is pretty much like basic, but we call it O'Hanlon code in class :D. We named it after the writer of the book.

That psudocode you wrote it in was exactly what I was looking for. Anyway, thanks again.

[DocEvi1]

you're welcome.