# How to Calculate the Sum of the Rows in a 2D?

A two-dimensional array, or matrix, is an array data structure with a set number of rows and columns and is used to hold an ordered collection of data elements. For example, a 3x3 two-dimensional array can be used to store the X, Y, and Z coordinates of a 3D object. Calculating the sum of the rows in a two-dimensional array is a task that can be accomplished using a few lines of code and the ability to identify and properly index the elements in an array.

### Prerequisites

Programming Language: You will need a basic understanding of one or more of the following programming languages to complete this task: Java, Python, C/C++, or JavaScript.

Data Structures: You will also need a basic understanding of data structures, specifically two dimensional arrays.

Programming Environment: You will need access to a compiler or interpreter, depending on the language you plan to use.

### Steps

Initialize a two-dimensional array and populate it with your desired elements.

In the language of your choice, define a variable to be used to hold the sum of the rows.

Create a `for` loop to iterate through the array and calculate the sum of the rows.

Create a loop to iterate through the columns of the array.

In the inner loop, assign the elements of the current column i to an index in the array.

Then, assign the sum to the previously defined variable.

1. Output the result.

### FAQ

Q. What is a two-dimensional array?

A. A two-dimensional array is a type of data structure that consists of rows and columns and is used to store an ordered collection of data elements.

Q. How do I calculate the sum of the rows in a two-dimensional array?

A. Calculating the sum of the rows in a two-dimensional array involves using a `for` loop to iterate through the array elements and a variable to keep track of the sum.

Q. What is the syntax for a for loop?

A. The syntax for a `for` loop is for (initialization; condition; increment/decrement).

Q. What is an index in an array?

A. An index in an array is the position of an element in the array. The index of the first element in an array is 0.

Q. What language(s) can I use to calculate the sum of the rows in a two-dimensional array?

A. You can use Java, Python, C/C++, or JavaScript to calculate the sum of the rows in a two-dimensional array.

### Resources

GeeksForGeeks - Two-dimensional array{:rel="nofollow noopener noreferrer"}

GeeksForGeeks - for loop{:rel="nofollow noopener noreferrer"}

WowKeren - Array Index{:rel="nofollow noopener noreferrer"}

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