Question

If there are 1 to 30 rows the program should: Calculate and display the average of all of values read into the array Calculate and display the average for every column in the array Find and display the smallest value for every row in the array You will need to have different functions to: Calculate the average for the array Calculate the average for a specified column Find the smallest value in a specified row

Answer 1

Answer:

see explaination

Explanation:

#Header file section

#include <iostream>

#include <iomanip>

#include <string>

#include <fstream>

using namespace std;

const int MAX_COLUMNS = 5;

//readFile function reads the input file and populates the array

int readFile(double values[][MAX_COLUMNS], int maxRows, string inputFileName)

{

//variable declaration

int i, j;

string line;

//Openin the file

fstream fin(inputFileName, ios::in);

//Check file exists or not

if (fin.fail())

{

//Failed to open file

return -1;

}

else

{

//Read the data

for (i = 0; i<maxRows && fin.good(); i++)

{

for (j = 0; j<MAX_COLUMNS; j++)

{

//Read the value from each row

fin >> values[i][j];

//Return 0 if the file contains no data

if (fin.fail() && i == 0)

{

return 0;

}

}

}

}

//Close the file

fin.close();

//Return the number of rows read

return i;

}

//Avearge function calcuates the average of the array

double average(double values[][MAX_COLUMNS], int numberRows)

{

double sum = 0;

int i, j;

//Iterate over rows

for (i = 0; i<numberRows; i++)

{

//Iterate over columns

for (j = 0; j<MAX_COLUMNS; j++)

{

//Calculate the sum

sum = sum + values[i][j];

}

}

//Find the avearge and return it

return (sum / (double)(numberRows*MAX_COLUMNS));

}

//columnAverage function calculates the average of each column

double columnAverage(double values[][MAX_COLUMNS], int column, int numberRows)

{

double sum = 0;

int i;

//Iterate over rows

for (i = 0; i<numberRows; i++)

{

//Calculate the sum

sum += values[i][column];

}

//Find the avearge and return it

return (sum / (double)(numberRows));

}

//smallestValue function returns the smallest value in each row

double smallestValue(double values[][MAX_COLUMNS], int rowNumber)

{

double minVal = values[rowNumber][0];

int i;

//Iterate over columns

for (i = 0; i<MAX_COLUMNS; i++)

{

//Calculate the sum

if (values[rowNumber][i] < minVal)

{

//Update the minimum value

minVal = values[rowNumber][i];

}

}

//Return min value

return minVal;

}

//Main function

int main()

{

int rows, cols;

const int MAX_ROWS = 20;

string inputFileName;

double grades[MAX_ROWS][MAX_COLUMNS];

int actualRows;

//Set to two decimal places

cout << fixed << setprecision(2);

//Read file name

//cout << "Enter input file name: ";

cin >> inputFileName;

//Read data from file

actualRows = readFile(grades, MAX_ROWS, inputFileName);

//Check number of rows

if (actualRows == -1)

{

//Print error message

cout << endl << "File \"" << inputFileName << "\" could not be opened " << endl;

}

else if (actualRows == 0)

{

//Print error message

cout << endl << "The input File \"" << inputFileName << "\" did not contain any data " << endl;

}

else

{

cout << "Processing " << actualRows << " rows, and " << MAX_COLUMNS << " columns " << endl;

//Print average value

cout << "Average for all values is " << average(grades, actualRows) << endl;

//Print column wise average

for (cols = 0; cols < MAX_COLUMNS; cols++)

{

//Print column wise average

cout << "Average for column " << cols << " is " << columnAverage(grades, cols, actualRows) << endl;

}

//Print row wise smallest value

for (rows = 0; rows < actualRows; rows++)

{

//Print row wise smallest value

cout << "Smallest value for row " << rows << " is " << smallestValue(grades, rows) << endl;

}

}

return 0;