Write a function int ALTERSUM( int B[][5] , int N, int M) in c++ to find and return the sum of elements from all alternate elements of a two-dimensional array starting from B[0][0].

Hint: If the following is the content of the array

4 5 1

2 8 7

9 6 3

The function should add elements B[0][0], B[0][2], B[1][1], B[2][0], B[2][2]

CBSE 2010

#include<iostream.h>

#include<conio.h>

#define x 10

#define y 5

int ALTERSUM(int B[][5], int M, int N)

{

int flag = 0, sum = 0;

for(int i = 0 ; i < M ; i++)

for(int j = 0 ; j < N ; j++)

{

if(flag == 0)

{ 

   sum = sum + B[i][j];

   flag = 1;

}

else

   flag = 0;

}

return sum;

}

void main()

{

int arr[x][y], r, c, i , j;

cout << "\n How many rows(<10)? " ;

cin >> r;

cout << "\n How many cols(< 5)?";

cin >> c;

/* Input elements */

for( i = 0 ; i < r ; i++)

for(j = 0 ; j< c ; j++)

{

cout << "\n Enter elements :";

cin >> arr[i][j];

}

/* display matrix */

for(i = 0; i < r  ; i++)

for(j = 0; j < c ; j ++)

    cout << arr[i][j] << " ";

cout<< endl;

int sum = ALTERSUM(arr, r, c);

cout << "\n The Sum of alternate elements = " << sum;

getch();

}

Write a function in C++ to print the product of each column of a two dimensional integer array passed as the argument of the function.

                                                    CBSE 2008

Explain : If the two dimensional array contains

         1     2     4

         3     5     6

         4     3     2

         2     1     5

The output should appear as :

Product of Column 1 = 24

Product of Column 2 = 30

Product of Column 3 = 240

                                                                                             

#include<iostream.h>

#include<conio.h>

#define r 10

# define c 10

void ProCol(int a[][], int m , int n) 

// n represents column

// m represents row

{

int pro[n], i, j ;

for(i = 0; i  <  n ; i++)

{

pro[i] = 1;

for(j = 0 ; j  <  m ; j ++)

{

pro[i] = pro[i] * a[j][i];

}

cout << "\n Product of Column 1 : " <<  pro[i];

}

}

void main()

{

int arr[r][c];

int row, col, i, j;

// Input dimension ~

cout <<  "\n Enter row & Column :";

cin >>  row >>  col ;

// Input elements for the array ~

for( i = 0; i <  row ; i++)

for ( j = 0 ; j <  col ; j++)

{

cout << "\n Enter the element for position : "   << i+1 << " , " <<  j+1 ;

cin >>  arr[i][j];

}

// Display the array

for( i = 0;  i < row ; i++ )

{

for( j =0 ; j < col ; j ++)

    cout   <<  arr[i][j]   <<  "  ";

cout  <<   endl;

}

// Calling the function

ProCol(arr, row, col);

getch();

}