Matrix

[Phillies12]

Write a test program that reads a 4-by-4 matrix and displays the sum of all its elements. Heres a sample run:

Enter a 4by4 matrix row by row:

1 2 3 4 [Enter]
5 6 7 8 [Enter]
9 10 11 12 [Enter]
13 14 15 16 [Enter]
Sum of the matrix is 136

Heres what I have so far but Im getting errors:

#include <iostream>
using namespace std;

const int COLUMN_SIZE = 4;

int sum(const int a[] [COLUMN_SIZE], int rowSize)
{
    int total = 0;
    for (int row = 0; row < rowSize; row++)
    {
        for (int column = 0; column < COLUMN_SIZE; column++)
        {
            total += a[row][column];
        }
    }

    return total;
}
int main()
{
    int m[4][4]=
    {
        {1,2,3,4},
        {5,6,7,8},
        {9,10,11,12},
        {13,14,15,16}
    };
    cout<< "Sum of the matrix"<< sum(m,4) << endl;
    return 0;
}

[chrisname]

Post the errors.

[Phillies12]

I cant post them right now, since I dont have the compiler program on my laptop.

Anyone else who could help?

[Albatross]

It compiles fine with g++ -pedantic, although that program doesn't quite do what it's supposed to.

-Albatross

[nickd1085]

Wish I could help ya dude but Im new at all this stuff too!

Is there anyway any of you could post the answer for this guy? Seems pretty lost.

[Veltas]

The sum function shouldn't be trying to take a constant, because we want to input a normal matrix, not a constant matrix.

EDIT: Sorry, that's wrong, read my next post.

[suppy]

hi here i hav designed it for any general matrix hope it helps......

#include<iostream.h>
void main()
{
int a[4][4],i,j,s=0;
cout<<"Enter the elements of the matrix"<<endl;
for(i=0; i<4; i++)
for(j=0; j<4; j++)
cin>>a[i][j];

cout<<"The sum of the elements of the matrix=";
for(i=0; i<4; i++)
for(j=0; j<4; j++)
s=s+a[i][j];
cout<<s;

}

[Browni3141]

@suppy: main() must return an int, use iostream not iostream.h, and please don't post full solutions.

[suppy]

@BROWNI3141: OK I WILL NT POST FULL SOLUTIONS FROM NXT TIME
BT WONT MAIN RETURN AN INT VALUE EVEN THOUGH V HAV NT MENTIONED IT??

[LB]

The return(0); at the end is implicit if not explicit, but you still must define main as int main() and not void main(). By the way, I think you hit caps lock by mistake.

[Veltas]

Whoops, discredit that about the constness, you're not changing the matrix so const is fine for the parameter.