Question 2

// sol-final-ex1.cpp : Defines the entry point for the console application.
/*
swap main with secondary diagonal bewteen a[4][4],b[4][4] using pointer concepts in (enters , swap , print)
*/

#include "stdafx.h"
#include "iostream"
using namespace std;

int main()
{
    int a[4][4], b[4][4], i, j,temp,x[4],y[4];
    int *c[4][4],*d[4][4],*f[4],*g[4];
    for (i = 0;i < 4;i++)
        for (j = 0;j < 4;j++) {
            c[i][j] = &a[i][j];
            d[i][j] = &b[i][j];
        }
    for (i = 0;i < 4;i++) {
        f[i] = &x[i];
        g[i] = &y[i];
    }
    for(i=0;i<4;i++)
        for (j = 0;j < 4;j++)
            cin >> *c[i][j];
    cout << "\n=================\n";
    for (i = 0;i<4;i++)
        for (j = 0;j < 4;j++)
            cin >> *d[i][j];
    for (i = 0;i < 4;i++)
        *f[i] = *c[i][i];
    for (i = 0;i < 4;i++)
        for (j = 0;j < 4;j++)
            if (i + j == 3)
                *g[i] = *d[i][j];
    cout << "\n=================\n";
    for (i = 0;i < 4;i++) {
        temp = *f[i];
        *f[i] = *g[i];
        *g[i] = temp;
    }
    for (i = 0;i < 4;i++)
         *c[i][i] = *f[i];
    for (i = 0;i < 4;i++)
        for (j = 0;j < 4;j++)
            if (i + j == 3)
                *d[i][j] = *g[i];
    cout << "After swap between main and secondary diagonal \n";
    for (i = 0;i < 4;i++) {
        for (j = 0;j < 4;j++) {
            cout << *c[i][j] << "  ";
        }cout << endl;
    }
    cout << "\n==========\n";
    for (i = 0;i < 4;i++) {
        for (j = 0;j < 4;j++) {
            cout << *d[i][j] << "  ";
        }cout << endl;
    }


    return 0;
}