Question 1

#include"stdafx.h"
#include <iostream>
/*
find the sum of second col and sub the sum from second diagonal item array size a[3][3]
*/
using namespace std;

int main()
{
    int i, j, a[3][3], sum = 0;
    for (size_t i = 0; i < 3; i++)
    {
        for (size_t j = 0; j < 3; j++)
        {
            cin >> a[i][j];
        }
    }
    for (size_t i = 0; i < 3; i++)
    {
        sum += a[i][1];
    }
    for (size_t i = 0; i < 3; i++)
    {
        for (size_t j = 0; j < 3; j++)
        {
            a[i][j] = sum - a[i][2 - i];
        }
    }
    return 0;
}