Temperature for the month of April 2017 has been recorded by the zambia metrological department as follows : 24.0,17.5,33.0,36.5,36.0,22.5,12.5, 44.0,15.5,33.0,41.5,23.5 explain in detail how these temperatures can be accessed and arranged in a 2DA matrix. Write a program to show how they can be arranged in a 3*3 matrix. Find the total sum of all the temperatures using 2DA

The sum of the temperatures is: 336

Explanation:

2-Dimensional Array:

A two dimensional array is defined as

int temp [3] [3]  

This is how a two dimensional array is defined in C++ programming language.

Here we have defined a 2-D array named temp which can store 3*3 = 9 int values

These 9 values are stored in 3 rows and 3 columns as below:

1, 2, 3

4, 5, 6

7, 8, 9

We are given the temperature for the month of April 2017 recorded by the Zambia metro-logical department.

24.0, 17.5, 33.0, 36.5, 36.0, 22.5, 12.5, 44.0, 15.5, 33.0, 41.5, 23.5

The given temperature values are 12 therefore, we would need a matrix of 3 rows and 4 columns ( 4 rows and 3 columns is also valid)

3*4 = 12 values

These 12 values will be arrange as below:

1, 2, 3, 4

5, 6, 7, 8

9, 10, 11, 12

C++ Program:

#include <iostream>

using namespace std;

int main()

{

// initialize the number of rows and columns

   int row = 3;

   int col = 4;

// initialize variable sum to store the sum of temperature values

   int sum = 0;

// initialize 2d array with given temperature values  

   float temp[row][col] = { {24.0, 17.5, 33.0, 36.5}, {36.0, 22.5, 12.5, 44.0}, {33.0, 41.5, 23.5, 15.5} };    

// we need two for loops to keep track of rows and columns

 for(int i = 0; i < row; ++i)

   {

       for(int j = 0; j < col; ++j)

       {

// to display individual temperature values

          cout<< "temp[" << i << "][" << j << "] = " << temp[i][j] <<endl;

// to sum the elements of the 2d array

          sum+=temp[i][j];

       }    

   }

// to display the sum of temperature values

cout<<"The sum of the temperatures is: "<<sum<<endl;

return 0;

}

Output:

temp[0][0] = 24

temp[0][1] = 17.5

temp[0][2] = 33

temp[0][3] = 36.5

temp[1][0] = 36

temp[1][1] = 22.5

temp[1][2] = 12.5

temp[1][3] = 44

temp[2][0] = 33

temp[2][1] = 41.5

temp[2][2] = 23.5

temp[2][3] = 15.5

The sum of the temperatures is: 336

Note:

The index start at 0 not 1 that is why you see rows from 0 to 2 and columns from 0 to 3.

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