Question

Provide code samples for the following in C#

a. Declare a two-dimensional array of integers names intArray17.

b. Create a loop to calculate the sum of every element in the first column.

c. Create a loop to calculate the sum of every element in the array.

Answer 1

The code is commented as required. Variables are named accordingly.

I have made the code in online ide.

Change the name of namespace accordingly to make it run in your ide.

Code:

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{

public class Program
{

public static void Main(string[] args)
{

//Your code goes here
//(a)
int[,] intArray17 = new int[3,2]{{1,2},{3,4},{5,6}}; //Declaring 2d array of size 3*2
//(b)
int sum_first_column=0;//Initializing sum of first column with 0
for(int i=0;i<3;i++){

sum_first_column+=intArray17[i,0];//Adding ith element of first column to required sum

}
Console.WriteLine("The sum of every elemnet in first column is: "+sum_first_column);
//(c)
int sum=0;//Initializing sum of first column with 0
for(int i=0;i<3;i++){

for(int j=0;j<2;j++)

sum+=intArray17[i,j];//Adding (i,j) element to required sum

}
Console.WriteLine("The sum of every elemnet is: "+sum);

}

}

}

Code screenshot and output: