C program to print the elements of a matrix in spiral order

Write a program that reads an MxN matrix A and prints its elements in spiral order.

You should start from the element in the 0th row and 0th column in the matrix and proceed in a spiral order as shown below.

1→ 2 → 3 → 4                       

                   ↓

5 → 6 → 7 8

↑   ↓ ↓

9    10←11 12

↑              ↓

13←14←15←16

Output for the above matrix: 1 2 3 4 8 12 16 15 14 13 9 5 6 7 11 10

INPUT:

First line contains two integers M and N separated by whitespace. The next M lines contain elements of matrix A, starting with the topmost row. Within each row, the elements are given from left to right.

OUTPUT:

Elements of the matrix printed in a spiral order. All the elements should be separated by whitespace.

CONSTRAINTS:

1 <= M <= 5, 1 <= N <= 5.

Elements in the matrix will be in the range [-100,100]

Implementation:

#include 
#include 

void printrow(int **a,int frow,int cstart,int cend)
{
 for(;cstart=cstart;cend--)
  printf("%d ",a[frow][cend]);
}

void reversecol(int **a,int rstart,int rend,int fcol)
{
 for(;rend>=rstart;rend--)
  printf("%d ",a[rend][fcol]);
}

void printmatrix(int **a,int r,int c)
{
 int rstart=0,cstart=0,rend=r,cend=c,i,j;
 while(rstart