Question

A matrix (2-dimensional) contains rows numbered from 2 to 9, and columns numbered from 1 to 100. In each cell of the matrix is a number equal to (row + col – row*col) (where row, col are the row and column numbers). Write a summation that will generate the total value of all cells in the matrix. (It is not necessary to calculate the total.)

Answer 1

*Note: Since no particular language was mentioned, I have used C++

#include<iostream>
using namespace std;
int main()
{
int sum=0;
int rows,cols;
while(1){
cout<<"Enter number of rows: ";
cin>>rows;
if(rows>1&&rows<10)
break;
else
cout<<"Wrong input! Please try again!";
}
while(1){
cout<<"Enter number of columns: ";
cin>>cols;
if(cols>0&&cols<101)
break;
else
cout<<"Wrong input! Please try again!";
}
int arr[rows][cols];
for(int i=0;i<rows;i++)
{
for(int j=0;j<cols;j++)
{
arr[i][j]=i+j-i*j;
sum=sum+arr[i][j];
}
}
for(int i=0;i<rows;i++)
{
for(int j=0;j<cols;j++)
{
cout<<arr[i][j]<<" ";
}
cout<<endl;
}
cout<<"sum :"<<sum;
}