Thread: Gaussian Elimination!!!

> This is what I have so far but I need help figuring out how to print the matrix from the function!!!
It's much more basic than that, if you're trying things like free(A)

Let's keep it simple for the moment.

Code:

#include <stdio.h>
#include <stdlib.h>

#define MAX_MAT_SIZE  10

void cmat(float mat[MAX_MAT_SIZE][MAX_MAT_SIZE]);
void printmat(float mat[MAX_MAT_SIZE][MAX_MAT_SIZE]);
void solvemat(float mat[MAX_MAT_SIZE][MAX_MAT_SIZE]);
void solutionmat(float mat[MAX_MAT_SIZE][MAX_MAT_SIZE]);

int main()
{
  float mat[MAX_MAT_SIZE][MAX_MAT_SIZE];
  int choice;
  do
  {
    printf("____Menu____\n");
    printf("1: Create Augmented Matrix\n");
    printf("2: Print Current Augmented Matrix\n");
    printf("2: Solve Augmented Matrix\n");
    printf("3: See Solution Matrix\n");
    printf("5: Exit\n");
    scanf("%d", &choice);
    
    switch(choice)
    {
      case 1: cmat(mat);
           break;
      case 2: printmat(mat);
           break;
      case 3: solvemat(mat);
           break;
      case 4: solutionmat(mat);
           break;
      case 5: printf("Quitting program!\n");
                     break;
      default: printf("Invalid choice!\n");
                      break;
    }
  } while (choice !=3);
  return 0;
}


void cmat(float mat[MAX_MAT_SIZE][MAX_MAT_SIZE])
{
  int i,j,n;
  printf("\nEnter the order of matrix: ");
  scanf("%d",&n);
  printf("\nEnter the elements of augmented matrix:\n\n");
  for(i=1; i<=n; i++)
  {
    for(j=1; j<=(n+1); j++)
    {
      printf("A[%d][%d] : ", i,j);
      scanf("%f",&mat[i][j]);
    }
  }
}

void printmat(float mat[MAX_MAT_SIZE][MAX_MAT_SIZE])
{
}

void solvemat(float mat[MAX_MAT_SIZE][MAX_MAT_SIZE])
{
}

void solutionmat(float mat[MAX_MAT_SIZE][MAX_MAT_SIZE])
{
}

A large fixed sized matrix makes it easier to think about the rest of the problem.

Your first step is to return 'n' from cmat() and pass that as a parameter to printmat().

Everything you need is in the example I posted.

There is no need to create pointers, or allocate memory, or any other advanced technique.

Just write a loop inside printmat and see.

> int i,j,n;
OK, so what is the value of n in your for loop.

Originally Posted by salem

Your first step is to return 'n' from cmat() and pass that as a parameter to printmat().

As I said, you need to return n from your input function, and pass that n to your print function.

Yeah, that would be a good start.

I suggest you read your reference book / course notes on how to declare a function and return a result.

But I see you've managed to get someone else to think for you already.
Help with functions!!!

Oh well, nevermind - there goes another learning opportunity for you.

You might consider that on your journey from the sea to the top of Everest, you've barely crawled to the top of the beach.
Quite how you'll fair when the hills appear is hard to say (badly IMO).