Question

Write a program that reads a matrix from the keyboard and displays the summations of all its rows on the screen. The size of matrix (i.e. the number of rows and columns) as well as its elements are read from the keyboard. A sample execution of this program is illustrated below: Enter the number of rows of the matrix: 3 Enter the number of columns of the matrix: 4 Enter the element at row 1 and chd umn 1: 1 Enter the element at row 1 and column 2: 2 Enter the element at row 1 and column 3: 3 Enter the element at row 1 and column 4:4 Enter the element at row 2 and column 1: 5 Enter the element at row 2 and column 2: 6 Enter the element at row 2 and column 3 Enter the element at row 2 and column 4: Enter the element at row 3 and column 1: 9 Enter the element at row 3 and column 2: 10 Enter the element at row 3 and column 3: 11 Enter the element at row 3 and column 4: 12 The sum of elements in the row 0 15: The sum of elements in the row 0 is: 1t0 The um of element in the row 1 is: The ธum of elementa in the row 1 i31 26 The Burn of element, in the row 2 is: The ธum of elements in the row 2 ia: 42 8 Use a list of lists to store your matrix. Your list could have as many elements as the number of the matrix' rows that each element includes as many numbers as the size of the matrix column. For example, the list [[1, 2,3,4]. [5, 6, 7, 8), [9, 10, 11, 121]] can represents the following matrix: 2 9 10 11 12

Answer 1

Program:

#include <iostream>

using namespace std;

int main()
{
int r,c;
  
cout<<"Enter the number of rows of the matrix: ";
cin>>r;
cout<<"Enter the number of colums of the matrix: ";
cin>>c;
  
int userMatrix[r][c];
  
for(int i =0;i<r;i++)
{
for(int j=0;j<c;j++)
{
cout<<"Enter the element at row "<<(i+1)<<" and colum "<<(j+1)<<": ";
cin>>userMatrix[i][j];
}
  
}
  
for(int i =0;i<r;i++)
{
int sum = 0;
for(int j=0;j<c;j++)
{
sum = sum + userMatrix[i][j];
}
  
cout<<"The sum of elements in row "<<i<<" is: "<<sum<<endl;
}
return 0;
}

Output:

Enter the number of rows of the matrix: 3 Enter the number of colums of the matrix: 4 Enter the element at row 1 and colum 1: 1 Enter the element at row 1 and colum 2: 2 Enter the element at row 1 and colum 3: 3 Enter the element at row 1 and colum 4: 4 Enter the element at row 2 and colum 1: 5 Enter the element at row 2 and colum 2: 6 Enter the element at row 2 and colum 3: 7 Enter the element at row 2 and colum 4: 8 Enter the element at row 3 and colum 1 9 Enter the element at row 3 and colum 2: 10 Enter the element at row 3 and colum 3 11 Enter the element at row 3 and colum 4: 12 The sum of elements in row 0 is: 10 The sum of elements in row 1 is: 26 The sum of elements in row 2 is: 42