matrix_operation.c

#include<stdio.h>
int main()
{
  int m,n,a[20][20],b[20][20],i,j,sum[20][20],sub[20][20],opt,tr[20][20],opt1,ch,e,f;
  printf("Enter the no. of rows: ");
  scanf("%d",&m);
  printf("Enter the no. of columns: ");
  scanf("%d",&n);
  printf("Enter the Data Elements of first matrices\n");
  for(i=0;i<m;i++)
    for(j=0;j<n;j++)
      scanf("%d",&a[i][j]);
  printf("Enter the no. of rows for second matrices: ");
  scanf("%d",&e);
  printf("Enter the no. of columns: ");
  scanf("%d",&f);
  printf("Enter the Data Elements of second matrices\n");
  for(i=0;i<e;i++)
    for(j=0;j<f;j++)
      scanf("%d",&b[i][j]);
  do{
    if(m==e&&n==f)
    {
      printf("Enter 1 for addtion or subtraction of matrices\n");
      if(n==e)
        printf("Enter 2 for multiplication of matrices\n");
      printf("Enter 3 for transpose of first matrices\n");
    }
    else if(m!=n&&n==e)
    {
      printf("Enter 2 for multiplication of matrices\n");
      printf("Enter 3 for transpose of first matrices\n");
    }
    else
      printf("Enter 3 for transpose of first matrices\n");
    scanf("%d",&ch);
    switch(ch)
    {
      case 1 :
          for(i=0;i<m;i++)
            for(j=0;j<n;j++)
            {
              sum[i][j]=a[i][j]+b[i][j];
              sub[i][j]=a[i][j]-b[i][j];
            }
          printf("Enter 1 for Addition or 2 for Subtraction: ");
          scanf("%d",&opt);
          switch(opt)
          {
            case 1 :
                printf("The resultant matrices is :\n");
                for(i=0;i<m;i++)
                {
                 for(j=0;j<n;j++)
                    printf("%3d",sum[i][j]);
                  printf("\n");
                }  
                break;
            case 2 :
                printf("The resultant matrices is :\n");
                for(i=0;i<m;i++)
                {
                  for(j=0;j<n;j++)
                    printf("%3d",sub[i][j]);
                  printf("\n");
                }
                break;
          }
          break;
      case 2 :
          printf("The resultant matrices is : \n");
          for(i=0;i<m;i++)
          {
            for(j=0;j<f;j++)
            { 
              sum[i][j]=0;
              for(int k=0;k<m;k++)
                sum[i][j]+=a[i][k]*b[k][j];
              printf("%d\t",sum[i][j]);
            }
            printf("\n");
          }
          break;
      case 3 :
          for(i=0;i<m;i++)
            for(j=0;j<n;j++)
              tr[j][i]=a[i][j];
          printf("The resultant matrices is :\n");
          for(i=0;i<n;i++)
          {
            for(j=0;j<m;j++)
              printf("%3d",tr[i][j]);
            printf("\n");
          }

          break;  
    }
  }while(ch>0);

}