# Can u help me,please

Hi,,
I am hoping that you will help me. I have trouble how can do this homework:
Write a program that allows the user to input a number of integers such as N, and then stores them in an integer matrix where:

1- The dimension of matrix = NXN.
2-Entries of matrix can take any number from 0-2.
3- Arrangement of entries of first row is the same arrangement of entries of first column.
4-The diagonal of matrix =o.
5- Total of every row =4,Also Total of every column.

Then, the program displays the result.

Your help would greatly be appreciated

Respectfully,,
Miss_Lolitta

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## Answers and Replies

Is there a particular language that the program is to be written in?

hey perhaps we can sit your exams for you too?

At least try and do it, and post what progress you have gotten through!

Isn't this in the wrong section? Shouldn't it be in the homework section?

I would like to write this program in C++.I learn the programming language at an institute,and I am not expert in this branch but I try to become better with your first help.

I would be so ever grateful if you could help me on how to go about writing this program.

thanks,,

DaveC426913
Gold Member
OK, forget about the programming language, forget about the computer. Pick up a pencil.

Design you logic first. Start at a high level, then break it down.
1] Gets integer from user: N.
2] Creates a matrix: NxN.
3] Fills in the diagonal values with zeros.
4] ?? - You must decide on your algorthim for checking against your rules.

Clearly step 4 is the bulk of the program. How do you propose to check?
Brute force?
000 000 000 = No.
000 000 001 = No
000 000 002 = No
000 000 010 = No
etc.
Is there a better way to do this? Knowing the rules you have to stay within, and the possible values (0-2), are there any steps you can eliminate? (Note that of the above tests, only 2 of them are valid, considering the "diagonal rule". You don't even need to test them.)

Hint: you're going to be needing a lot of loops and a lot of 'if's.

There is no point in going anywhere near a programming language or a computer until you've worked out your logic.

Last edited:
Really, forget about the programming language, forget about the computer. Look at this method to solve this problem in maths:

1] Gets integer from user: N. such as N=3

2] Creates a matrix: 3x3

X Y Z
X Y Z
X Y Z

3] Fills in the diagonal values with zeros.

0 Y Z
X 0 Z
X Y 0

>>> then we have the following system:

0 Y Z = 4
X 0 Z = 4
X Y 0 = 4

>>> by solving this system we have a unique solution:X=2,Y=2,Z=2

>>> So, we have matrix

0 2 2
2 0 2
2 2 0

Hint: we have a symmetry between diagonals of matrix

I know that there is relation between maths and CS to solve mathematical problems..because of this I would like to study the programming languages.

Any help you give I'd be very glad . Thank you for your assistance.