Programming challenge: rotating a matrix 90 degrees in place.cpp

// rotate 90 degrees
// Written By: Wael Qassas ,23-8-2016
// Original post: https://blog.svpino.com/2015/05/10/programming-challenge-rotating-a-matrix-90-degrees-in-place
#include <iostream.h>
int main()
{int i,j,temp;
const int N=5;
	int A[][N]={{1,2,3,4,5},
				{6,7,8,9,10},
				{11,12,13,14,15},
				{16,17,18,19,20},
				{21,22,23,24,25}};
	
	for( i=0;i<5;i++)
		for( j=0;j<i;j++)
		{temp=A[i][j];
		A[i][j]=A[j][i];
		A[j][i]=temp;
		}

	
for(i=0;i<N;i++)   // 5/2 is integer division
  for(j=0;j<N/2;j++)
  {	temp=A[i][j];
	A[i][j]=A[i][(5-1)-j];   // just swap columns
	A[i][(5-1)-j]=temp;
	}

 for(i=0; i<5; i++)
	{	for(j=0; j<5; j++)
			cout<<A[i][j]<<"\t";
		cout<<endl;
	}

return 0;}