Question

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Write a C++ program that calculates the working hours of multiple employees during a weekday. The program will take the last digits of your student id as the number of row employees of the array (if your last digits are less than or equal to 7 add 3 to it) and the weekdays are the column then fill the array with using random integer inputs (between 0 - 10 ) (stores the random numbers in a 2D array using both stand() and rand) functions).

Answer 1

// C++ program to create a 2D array of working hours for employee for all week day SUN-SAT with random numbers
// between 0 and 10(exclusive) and calculate the statistics using this array

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <iomanip>
using namespace std;

// function prototype
void displayEmployee(int workingHours[][7], int numEmployee, int numDays);
double average_all_employee_all_days(int workingHours[][7], int numEmployee, int numDays);
double* average_all_employee_per_day(int workingHours[][7], int numEmployee, int numDays);
double* average_all_day_per_employee(int workingHours[][7], int numEmployee, int numDays);

int main()
{
srand(time(0));
// Assuming num of employees = 8
// data for the working hours
int workingHours[8][7] ; // 8 employees and 7 weekdays SUN-SAT
// number of employee and number of days
int numEmployee = 8, numDays = 7;
// array to store the days
string days[] = {"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};
// loop to fill the array with random working hours between 0 and 10(exclusive)
for(int i=0;i<numEmployee;i++)
{
for(int j=0;j<numDays;j++)
{
workingHours[i][j] = rand()%10; // generates random integer between 0 and 10 (exclusive)
}
}

// display the array
displayEmployee(workingHours, numEmployee, numDays);

// get the average of all employees for all days
double avg = average_all_employee_all_days(workingHours, numEmployee, numDays);
// get the average for all days per employee
double* avg_per_emp = average_all_day_per_employee(workingHours, numEmployee, numDays);
// get the average for all employees per day
double* avg_per_day = average_all_employee_per_day(workingHours, numEmployee, numDays);

cout<<fixed<<setprecision(2);
// display the result
cout<<endl<<"Average of working hours for all employees for all weekday: "<<avg<<endl;
cout<<endl<<"Average of working hours for all employees per one day: "<<endl;
for(int i=0;i<numDays;i++)
{
cout<<days[i]<<" : "<<avg_per_day[i]<<endl;
}

cout<<endl<<"Average of working hours for all weekday per one employee: "<<endl;
for(int i=0;i<numEmployee;i++)
{
cout<<"Employee "<<(i+1)<<" : "<<avg_per_emp[i]<<endl;
}

return 0;
}

// function to display the data of the input array for given number of rows and columns
void displayEmployee(int workingHours[][7], int numEmployee, int numDays)
{
cout<<left<<setw(20)<<""<<right<<setw(5)<<"SUN"<<right<<setw(5)<<"MON"<<right<<setw(5)<<"TUE"<<right<<setw(5)<<"WED"
<<right<<setw(5)<<"THU"<<right<<setw(5)<<"FRI"<<right<<setw(5)<<"SAT"<<endl;

for(int i=0;i<numEmployee;i++)
{
cout<<right<<setw(15)<<"Employee "<<left<<setw(5)<<(i+1);

for(int j=0;j<numDays;j++)
cout<<right<<setw(5)<<workingHours[i][j];
cout<<endl;
}
}

// function to calculate the overall average of the array
double average_all_employee_all_days(int workingHours[][7], int numEmployee, int numDays)
{
double total_hours = 0; // set total hours to 0
// loop over the rows
for(int i=0;i<numEmployee;i++)
{
// loop over the columns
for(int j=0;j<numDays;j++)
{
total_hours += workingHours[i][j]; // add the entry to total_hours
}
}

return ((double)total_hours)/(numEmployee*numDays); // return the average
}

// function to calculate the average for each column
double* average_all_employee_per_day(int workingHours[][7], int numEmployee, int numDays)
{
double *avg = new double[numDays]; // create the array of size equal to numDays
// loop over the columns
for(int i=0;i<numDays;i++)
{
avg[i] = 0; // set the ith entry in avg to 0
// loop over the rows
for(int j=0;j<numEmployee;j++)
avg[i] += workingHours[j][i]; // add the (j,i) entry to avg(i)
avg[i] = avg[i]/numEmployee; // calculate the average per day
}

return avg;
}

// function to calculate the average for each row
double* average_all_day_per_employee(int workingHours[][7], int numEmployee, int numDays)
{
double *avg = new double[numEmployee]; // create the array of size equal to numEmployee
// loop over the rows
for(int i=0;i<numEmployee;i++)
{
avg[i] = 0; // set the ith entry of avg to 0
// loop over the columns
for(int j=0;j<numDays;j++)
avg[i] += workingHours[i][j]; // add the (i,j) entry to avg(i)
avg[i] = avg[i]/numDays; // calculate the average for ith employee
}

return avg;
}

//end of program

Output:

Employee 1 Employee 2 Employee 3 Employee 4 Employee 5 Employee 6 Employee 7 Employee 8 SUN MON TUE WED THU FRI SAT 1 2 2 8 6 0 3 6 0 5 5 8 6 8 8 4 3 0 2 1 0 2 3 2 5 6 5 2 9 4 1 6 1 3 5 6 7 9 3 5 3 4 8 9 9 8 3 9 4 6 0 7 3 9 OOONOON 00 Omno wiono Average of working hours for all employees for all weekday: 4.55 Average of working hours for all employees per one day: SUN : 3.50 MON : 3.50 TUE : 5.88 WED : 4.38 THU : 5.25 FRI : 4.00 SAT : 5.38 Average of working hours for all weekday per one employee: Employee 1 : 4.29 Employee 2 : 3.86 Employee 3 : 4.43 Employee 4 : 2.71 Employee 5 : 4.00 Employee 6 : 5.43 Employee 7 : 6.29 Employee 8 : 5.43