Question

Language: c++

Write a program that opens a file to read 20 floating point numbers and store the information in a 4 x 5 array. The program should do the following:

a. Compute the average of each set of 5 values

b. Determine the largest value of the 20 values

c. Report the results; print the original matrix and average of each row, and the largest of the values in this function.

d. At the end of the program prompt the user press "Y or y" and any other character to quit.

Each part should be handled by a separate function. For parts a and b you must use pointer notations. Do not use any global arrays or variables.

Answer 1

PROGRAM:

#include <iostream>
#include <fstream>
using namespace std;
// Function prototypes
void compute_average(float array[4][5],float average[4]);
float find_largest(float array[4][5]);
void print_results(float array[4][5],float average[4],float large);
// Main Function
int main()
{
float arr[4][5],avg[4];
float largest;
int i,j;
char c;
string line;
ifstream myfile;
  
myfile.open("float_numbers.txt"); // Opening the file for reading
  
if(!myfile) // Checking whether the file is opened or not
{
cout << "Unable to open file";
exit(1); // terminate with error
}
  
// Reading floating-point numbers from file and storing them into an array
for(i=0;i<4;i++)
{
for(j=0;j<5;j++)
{
myfile >> arr[i][j];
}
}
// Calling the function to compute the average of each row in array
compute_average(arr,avg);
// Calling the function to find the largest of all numbers in the array
largest = find_largest(arr);
  
do
{
// Calling the function to print the results
print_results(arr,avg,largest);
cout << "\nY/y or any other character to quit\n";
cin >> c;
}while((c == 'N') || (c == 'n'));
  
myfile.close();
}
//Definition of function to compute the average of each row in array
void compute_average(float array[4][5],float average[4])
{
int i,j;
  
for(i=0;i<4;i++)
{
average[i] = 0;
for(j=0;j<5;j++)
{
average[i] += array[i][j];
}
}
  
for(i=0;i<4;i++)
{
average[i] = (average[i])/5;
}
}
// Definition of the function to find the largest of all numbers in the array
float find_largest(float array[4][5])
{
int i,j;
float max=0.0;
  
for(i=0;i<4;i++)
{
for(j=0;j<5;j++)
{
if(array[i][j]>max)
max = array[i][j];
}
}
return max;
}
// Definition of the function to print the results
void print_results(float array[4][5],float average[4],float large)
{
int i,j;
cout << "\nOriginal Matrix: \n";
  
for(i=0;i<4;i++)
{
for(j=0;j<5;j++)
{
cout << array[i][j] << "\t";
}
cout << "\n";
}
  
cout << "\nAverage of each row: \n";
  
for(i=0;i<4;i++)
{
cout << average[i] << "\n";
}
  
cout << "\nLargest value is: " << large;
}

Please refer to the following screenshot of the program for indentation of the code:

Sample Inputs and Outputs:

Input File1:

Output:

Input File2:

Output: