# Ruby program to calculate the sum of matrix elements

Ruby Example: Write a program to calculate the sum of matrix elements.
Submitted by Nidhi, on January 23, 2022

Problem Solution:

In this program, we will create a two-dimensional array. Then we read the matrix from the user and calculate the sum of matrix elements.

Program/Source Code:

The source code to calculate the sum of matrix elements is given below. The given program is compiled and executed successfully.

```# Ruby program to calculate the sum
# of matrix elements

TwoDArr = Array.new(2){Array.new(2)}
sum = 0;

printf "Enter elements of MATRIX:\n";
i = 0;
while (i < 2)
j = 0;
while (j < 2)
printf "ELEMENT [%d][%d]: ", i, j;
TwoDArr[i][j] =  gets.chomp.to_i;
j = j + 1;
end
i = i + 1;
end

printf "MATRIX:\n";
i = 0;
while (i < 2)
j = 0;
while (j < 2)
sum = sum +TwoDArr[i][j];
print TwoDArr[i][j]," ";
j = j + 1;
end
i = i + 1;
print "\n";
end

printf "Sum of matrix elements: %d\n",sum;
```

Output:

```Enter elements of MATRIX:
ELEMENT [0][0]: 1
ELEMENT [0][1]: 2
ELEMENT [1][0]: 3
ELEMENT [1][1]: 4
MATRIX:
1 2
3 4
Sum of matrix elements: 10
```

Explanation:

In the above program, we created a two-dimensional array TwoDArr. Then we read the elements of the 2D array. After that, we calculated the sum of matrix elements and printed the result.