Question

I want to change rows into column and column into rows of that 2-D array

I want a program which takes input and gives output as below.

Input:   1    2    3                       
         4    5    6

Output:  1    4
         2    5
         3    6

Input:   1    2    3
         4    5    6
         7    8    9

Output:  1    4    7
         2    5    8
         3    6    9

I did a sample which in hardcoded array as below

int main()
{
    int i,j;
    int grades[2][3] = { {55, 60, 65},
                                           {85, 90, 95} 
                                        };
    for( j = 0; j < 3; j++)
    {       
      for( i = 0; i < 2;i++)
      {
         printf("%d\t",grades[i][j]);
      }
      printf("\n");
    }

    return 0;
}

Its long time since i programmed in C , is there anyway we can make things dynamic or better way of doing the same. Right now its hardcoded.

I remember we have to use malloc or so , is that right.

psuedo code is also fine.

Answer 1

void main()

{

   clrscr();

   int in[10][10];
   int out[10][10];

   int row,column,i,j;
   printf("enter row");
   scanf("%d",&row);
   printf("Enter column");
   scanf("%d",&column);
   //storing values in matrix
   for(i=1;i<=row;i++)
   {
      for(j=1;j<=column;j++)
      {
        printf("Enter (%d,%d)th value",i,j);
        scanf("%d",&in[i-1][j-1]);
      }
   }
   //show stored values
   printf("\ninput is\n\n");
   for(i=0;i<row;i++)
   {
      for(j=0;j<column;j++)
      {
        printf("%d\t",in[i][j]);
      }
      printf("\n");
   }
   //show transposed value. it is also stored in out matrix
   printf("\nOutput is\n\n");
   for(i=0;i<column;i++)
   {
      for(j=0;j<row;j++)
      {
        printf("%d\t",in[j][i]);
        out[i][j]=in[j][i];
      }
      printf("\n");
   }

   getch();

}

//////////////////////////////////////

input matrix is stored in in[][] matrix and output matrix stored in out[][] matrix.
this program will work for any matrix with row and column below 10 if we increase the matrix variable value ,it will work for larger matrix also .