Rewrite the program using class. It needs to be able to calculate the quarters f
ID: 3835343 • Letter: R
Question
Rewrite the program using class. It needs to be able to calculate the quarters for each year.
#include<iostream>
#include<iomanip>
using namespace std;
class Test {
public:
void doCalculation(int years) //amount of years and quarters)
{
double sales = 0;
double nsales = 0;
cout << "This program will calculate avergae sales over a period of years. How many years do you wish to average? ";
while((years < 0)){//invalid
cin.clear();//clear and reinput
cout << "Years must be at least one. Please re-enter: ";//> 1
cin >> years;
}//quarters
for(int y = years; years >= y; y++){
cout << "Year " << y << endl;//start quarters with years
cout << "Sales amount for quarter 1? ";//quarter 1
while((cin >> sales) && (sales < 0)){//invalid input of negatives
cout << "Sales amount must be zero or greater" << endl;//nuuuu
cin.clear();//clear and reinput
cout << "Sales amount for quarter 1? ";//input amount for 1
}
nsales += sales;
cout << "Sales amount for quarter 2? ";// quarter 2
while((cin >> sales) && (sales < 0)){//invalid input of negatives
cout << "Sales amount must be zero or greater" << endl;//nuuuu
cin.clear();//clear and reinput
cout << "Sales amount for quarter 2? ";// input amount for 2
}
nsales += sales;
cout << "Sales amount for quarter 3? ";//quarter 3
while((cin >> sales) && (sales < 0)){//invalid input of negatives
cout << "Sales amount must be zero or greater" << endl;//nuuu
cin.clear();//clear and reinput
cout << "Sales amount for quarter 3? ";// input amount for 3
}
nsales += sales;
cout << "Sales amount for quarter 4? ";//quarter 4
while((cin >> sales) && (sales < 0)){//invalid input of negatives
cout << "Sales amount must be zero or greater" << endl;//nuuuu
cin.clear();//clear and reinput
cout << "Sales amount for quarter 4? ";// input amount for 4
}
nsales += sales;
}//formula
double avg = nsales/(years*4);
cout << "Over a period of " << years*4 << " quarters: " << fixed << setprecision(2) << nsales << endl;//setprecision fixed
cout << "Average quartely sales for the period is: " << fixed << setprecision(2) << avg << endl;//setprecision fixed
}
};//end
int main() {
int years;
cout<<"Enter years: ";
cin >> years;
Test t;
t.doCalculation(years);
}
Explanation / Answer
#include<iostream>
#include<iomanip>
using namespace std;
class Test {
public:
void doCalculation(int years) //amount of years and quarters)
{
double sales = 0;
double nsales = 0;
cout << "This program will calculate avergae sales over a period of years. How many years do you wish to average? ";
while((years < 0)){//invalid
cin.clear();//clear and reinput
cout << "Years must be at least one. Please re-enter: ";//> 1
cin >> years;
}//quarters
for(int y = 1; years >= y; y++){
cout << "Year " << y << endl;//start quarters with years
cout << "Sales amount for quarter 1? ";//quarter 1
while((cin >> sales) && (sales < 0)){//invalid input of negatives
cout << "Sales amount must be zero or greater" << endl;//nuuuu
cin.clear();//clear and reinput
cout << "Sales amount for quarter 1? ";//input amount for 1
}
nsales += sales;
cout << "Sales amount for quarter 2? ";// quarter 2
while((cin >> sales) && (sales < 0)){//invalid input of negatives
cout << "Sales amount must be zero or greater" << endl;//nuuuu
cin.clear();//clear and reinput
cout << "Sales amount for quarter 2? ";// input amount for 2
}
nsales += sales;
cout << "Sales amount for quarter 3? ";//quarter 3
while((cin >> sales) && (sales < 0)){//invalid input of negatives
cout << "Sales amount must be zero or greater" << endl;//nuuu
cin.clear();//clear and reinput
cout << "Sales amount for quarter 3? ";// input amount for 3
}
nsales += sales;
cout << "Sales amount for quarter 4? ";//quarter 4
while((cin >> sales) && (sales < 0)){//invalid input of negatives
cout << "Sales amount must be zero or greater" << endl;//nuuuu
cin.clear();//clear and reinput
cout << "Sales amount for quarter 4? ";// input amount for 4
}
nsales += sales;
}//formula
double avg = nsales/(years*4);
cout << "Over a period of " << years*4 << " quarters: " << fixed << setprecision(2) << nsales << endl;//setprecision fixed
cout << "Average quartely sales for the period is: " << fixed << setprecision(2) << avg << endl;//setprecision fixed
}
};//end
int main() {
int years;
cout<<"Enter years: ";
cin >> years;
Test t;
t.doCalculation(years);
}
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