Write a program that calculates the total and average marks of 4 subjects for 3 students(c++ programming)
Output:in the file

#include <iostream>

int main(int argc, char* argv[]) {

   //An array that stores students' ID and marks, respectively.

   //First column's are for ID, others for marks.

   //Ex. data[0][0], data[1][0], ... indicates the first student's ID.

   int data[3][5];

   //Variable that stores total of the marks.

   float total = 0;

   //Iterate over 3 students.

   for(int i=0; i<3; i++) {

       //Waiting for ID Input.

       std::cout << "Enter Student ID: "; std::cin >> data[i][0];

       //Iterate marks.

       for(int j=0; j<4; j++) {

           std::cout << "Enter mark: "; std::cin >> data[i][j+1];

           total += data[i][j+1];

       }

   }

   //Print the result.

   std::cout << "\n\nThe total marks for all students is: " << total << "\n\nThe average mark is: " << total / 12 << std::endl;

   return 0;

}

A program that calculates the total and average marks of 4 subjects for 3 students is as follows:

          #include <iostream>

          int main(int argc, char* argv[]) {

          //An array that stores students' IDs and marks, respectively.

         //First column's are for ID, others for marks.

         //Ex. data[0][0], data[1][0], ... indicates the first student's ID.

         int data[3][5];

         //Variable that stores total of the marks.

         float total = 0;

        //Iterate over 3 students.

        for(int i=0; i<3; i++) {

       //Waiting for ID Input.

       std::cout << "Enter Student ID: "; std::cin >> data[i][0];

      //Iterate marks.

      for(int j=0; j<4; j++) {

      std::cout << "Enter mark: "; std::cin >> data[i][j+1];

      total += data[i][j+1];

      }

      }

     //Print the result.

std::cout << "\n\nThe total marks for all students is: " << total << "\n\nThe average mark is: " << total / 12 << std::endl;

   return 0;

   }

The significance of C++ programming may be determined by the fact that it is used for making browsers, applications, and software. Also, C++ is used majorly to make operating systems, and almost all operating systems are built using C++, for example, Mac Os, Windows, Linux, etc.

The programming languages direct a computer to complete these commands over and over again, so people do not have to do the task repeatedly. Instead, the software can do it automatically and accurately.

Therefore, a program that calculates the total and average marks of 4 subjects for 3 students is well-described above.

To learn more about the Programming language, refer to the link:

https://brainly.com/question/16936315

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B
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A
C
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B
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B
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C
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2. The relationship between Customer and Satisfaction.
3. The relationship between Online and Visits.
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A. prototype
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In java I need help on this specific code for this lab.


Problem 1:


Create a Class named Array2D with two instance methods:


public double[] rowAvg(int[][] array)


This method will receive a 2D array of integers, and will return a 1D array of doubles containing the average per row of the 2D array argument.


The method will adjust automatically to different sizes of rectangular 2D arrays.


Example: Using the following array for testing:


int [][] testArray =

{

{ 1, 2, 3, 4, 6},

{ 6, 7, 8, 9, 11},

{11, 12, 13, 14, 16}

};

must yield the following results:


Averages per row 1 : 3.20

Averages per row 2 : 8.20

Averages per row 3 : 13.20

While using this other array:


double[][] testArray =

{

{1, 2},

{4, 5},

{7, 8},

{3, 4}

};


must yield the following results:


Averages per row 1 : 1.50

Averages per row 2 : 4.50

Averages per row 3 : 7.50

Averages per row 4 : 3.50

public double[] colAvg(int[][] array)


This method will receive a 2D array of integers, and will return a 1D array of doubles containing the average per column of the 2D array argument.


The method will adjust automatically to different sizes of rectangular 2D arrays.


Example: Using the following array for testing:


int [][] testArray =

{

{ 1, 2, 3, 4, 6},

{ 6, 7, 8, 9, 11},

{11, 12, 13, 14, 16}

};

must yield the following results:


Averages per column 1: 6.00

Averages per column 2: 7.00

Averages per column 3: 8.00

Averages per column 4: 9.00

Averages per column 5: 11.00

While using this other array:


double[][] testArray =

{

{1, 2},

{4, 5},

{7, 8},

{3, 4}

};


must yield the following results:


Averages per column 1: 3.75

Averages per column 2: 4.75



My code is:


public class ArrayDemo2dd

{


public static void main(String[] args)

{

int [][] testArray1 =

{

{1, 2, 3, 4, 6},

{6, 7, 8, 9, 11},

{11, 12, 13, 14, 16}

};

int[][] testArray2 =

{

{1, 2 },

{4, 5},

{7, 8},

{3,4}

};


// The outer loop drives through the array row by row

// testArray1.length has the number of rows or the array

for (int row =0; row < testArray1.length; row++)

{

double sum =0;

// The inner loop uses the same row, then traverses all the columns of that row.

// testArray1[row].length has the number of columns of each row.

for(int col =0 ; col < testArray1[row].length; col++)

{

// An accumulator adds all the elements of each row

sum = sum + testArray1[row][col];

}

//The average per row is calculated dividing the total by the number of columns

System.out.println(sum/testArray1[row].length);

}

} // end of main()


}// end of class


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Here is a sample run:

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The hours, minutes, and seconds for total seconds 342324 is 23:05:24

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Output each floating-point value with two digits after the decimal point, which can be achieved as follows:
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Ex: If the input is:
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the output is:
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1 #include
2 #include
3 #include
4 using namespace std;
5
6 int main() {
7
8 /* Type your code here. */
9
10 return 0;
11 }
12

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• Algorithm B solves problems of size n by recursively solving two subproblems of size n − 1 and then combining the solutions in constant time.
• Algorithm C solves problems of size n by dividing them into nine sub-problems of size n=3, recursively solving each sub-problem, and then combining the solutions in O(n2) time.
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