Question

Assignment: Write a C function that accepts the pointer to a matrix of integer numbers (i.e. a two-dimensional array), number of rows and number of columns as input and prints the matrix after rotating it 90 degrees clockwise. Example: void rotate-matrix (int* matrix, int row, int column) Inputs: row 4, column-6 and the pointer to the matrix below: 2 3 6 5 8 0 Output:

Answer 1

/* c program to rotate a matrix 90 degrees clock wise*/

void rotate_matrix( int *matrix,int row,int column);

int a[20][20];

int main()

{

int rows,columns,i,j;

clrscr();

printf("\n Enter the number of rows and columns of a matrix");

scanf("%d%d",&rows,&columns);

for(i=0;i<rows;i++)

{

for(j=0;j<columns;j++)

{

scanf("%d",&a[i][j]); /* reading elements into matrix */

}

}

printf("\n Original matrix is \n");

for(i=0;i<rows;i++)

{

for(j=0;j<columns;j++)

{

printf("%d\t",a[i][j]); /* reading elements into matrix */

}

printf("\n");

}

printf("\n Matrix after 90 degrees clock wise rotation\n");

rotate_matrix((int *)a,rows,columns);

getch();

return 0;

}

void rotate_matrix(int *matrix,int row,int column) /* logic to rotate 90 degrees clockwise */

{

int i,j;

for(i=0;i<column;i++)

{

for(j=row-1;j>=0;j--)

{

printf("%d\t",a[j][i]);

}

printf("\n");

}

}

Output:

Enter the number of rows and columns of a matrix4 0 1 3 6 3 1 2 3 6 5 8 0 7 4 8 6 2 1 3 4 6 2 1 6 Original matrix is 6 8 6 8 6 6 Matrix after 90 degrees clock wise rotation 8 6 5 8 6