LabAssignment 1c (35 points). Write a C function to do matrix (2D) multiplicatio

Question

LabAssignment 1c (35 points). Write a C function to do matrix (2D) multiplication calculation. You can name the function like mat_multiply0. The function takes two arguments, A and B, which both are int matrix. The function returns a matrix C, which is the multiplication of A and B. Row and columns numbers of A and B are not fixed. Search online for matrix multiplication rules, if you are not sure. You can create two small (rows and column numbers are between 3-5) matrices in your main function to test mat_multiply0 Tip: you should check the dimension match in the beginning of your function and print out error message, if the dimensions of A and B are not matched for multiplication.

Explanation / Answer

#include<stdio.h>
#include<stdlib.h>
void mat_multiply(int A[][10],int B[][10], int r1,int c1, int r2, int c2 )
{
   int i,j,k;
   int C[10][10];

          
   for(i=0;i<r1;i++)       //Multiplication starts here
   {
       for(j=0;j<c2;j++)
       {
           C[i][j]=0;
           for(k=0;k<r2;k++)
               C[i][j]   += A[i][k] * B[k][j];
       }
   }
   printf(" The result of multiplication of matrices A & B is ");
   for(i=0;i<r1;i++)
   {
  
       for(j=0;j<c2;j++)
           printf("%5d",C[i][j]);
       printf(" ");
   }
          
  
}
int main()
{
   int r1,c1,r2,c2;       //matrix dimensions for A and B
   int i,j,k;
   printf(" enter first matrix rows & columns ");
   scanf("%d%d",&r1,&c1);
   printf(" enter second matrix rows & columns ");
   scanf("%d%d",&r2,&c2);
   while(c1 != r2)       //loop till the matrix multiplication is possible
   {
   printf(" Matrix multiplication is not possible ");
   printf(" enter first matrix rows & columns ");
   scanf("%d%d",&r1,&c1);
   printf(" enter second matrix rows & columns ");
   scanf("%d%d",&r2,&c2);
   }
   int A[r1][c1],B[r2][c2];
   printf(" Enter first matrix data elements ");
   for(i=0;i<r1;i++)
       for(j=0;j<c1;j++)
       {
           printf("A[%d][%d] = ",i,j);
           scanf("%d",&A[i][j]);
       }

   printf(" Enter second matrix data elements ");
   for(i=0;i<r2;i++)
       for(j=0;j<c2;j++)
       {
           printf("B[%d][%d] = ",i,j);
           scanf("%d",&B[i][j]);
       }
  
   mat_multiply(A,B,r1,c1,r2,c2);
  
   return 0;
  
  
  
}

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