Clockwise Print of a 4X4 matrix in c - c

Question

hi I am trying to print a 4 x 4 matrix in clockwise direction,
Input:
1 2 3 4
12 13 14 5
11 16 15 6
10 9 8 7
Expected output is:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
My code is:
int MAXR=3,MAXC=3,MINR=0,MINC=0;
while(MINR < MAXR && MINC < MAXC)
{
for(i=MINC;i<=MAXC;i++)
{
printf("%d ",arr[MINR][i]);
}
for(j=MINR+1;j<=MAXR;j++)
{
printf("%d ",arr[j][MAXC]);
}
for(i=MAXC-1;i>=MINC;i--)
{
printf("%d ",arr[MAXR][i]);
}
MINR++;
if((MINR%2)==0)
{
MINC=MINC+2;
}
//MAXR--;
//MAXC--;
//printf("\nMAXR=%d MINR=%d\n",MAXR,MINR);
for(j=MAXR-1;j>MINR;j--)
{
printf("%d ",arr[j][MINC]);
}
MAXR--;
MAXC--;
}
But output is:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 11
Please help me to fix the bug!
Thanks!
output is:

Answer 1

I hope you have fixed your defect by now. But it was a fun spec, so here is my version:
gcc (GCC) 4.7.3: gcc -Wall -Wextra -std=c99 spiral.c
#include <stdio.h>
int main() {
int matrix[4][4] = {
{ 1, 2, 3, 4 },
{ 12, 13, 14, 5 },
{ 11, 16, 15, 6 },
{ 10, 9, 8, 7 } };
int edge = sizeof(matrix[0]) / sizeof(int) - 1;
int i = 0;
int j = 0;
printf("%d ", matrix[i][j]);
for (int c = 0; c < edge; ++c) { printf("%d ", matrix[i][++j]); }
while (0 < edge) {
for (int c = 0; c < edge; ++c) { printf("%d ", matrix[++i][j]); }
for (int c = 0; c < edge; ++c) { printf("%d ", matrix[i][--j]); }
--edge;
for (int c = 0; c < edge; ++c) { printf("%d ", matrix[--i][j]); }
for (int c = 0; c < edge; ++c) { printf("%d ", matrix[i][++j]); }
--edge;
}
return 0;
}
My approach was to write out the sequence of required changes to i and j and find the pattern. What I found was that the pattern appeared after the first line, so I did that as a separate initial step.

Answer 2

The following code will help you to print of a matrix of any size (rows/cols) clockwisely.
void printMatrixClockwisely(int** numbers, int rows, int columns)
{
if(numbers == NULL || columns <= 0 || rows <= 0)
return;
int start = 0;
while(columns > start * 2 && rows > start * 2)
{
PrintMatrixInCircle(numbers, columns, rows, start);
++start;
}
}
void printNumber(int number)
{
printf("%d\t", number);
}
void PrintMatrixInCircle(int** numbers, int columns, int rows, int start)
{
int endX = columns - 1 - start;
int endY = rows - 1 - start;
// print a row from left to right
for(int i = start; i <= endX; ++i)
{
int number = numbers[start][i];
printNumber(number);
}
// print a col from up to down
if(start < endY)
{
for(int i = start + 1; i <= endY; ++i)
{
int number = numbers[i][endX];
printNumber(number);
}
}
// print a row from right to left
if(start < endX && start < endY)
{
for(int i = endX - 1; i >= start; --i)
{
int number = numbers[endY][i];
printNumber(number);
}
}
// print a col from down to up
if(start < endX && start < endY - 1)
{
for(int i = endY - 1; i >= start + 1; --i)
{
int number = numbers[i][start];
printNumber(number);
}
}
}