Which environment variable affects the number of past commands used in the current shell session?
1 answer:
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Answer:
<em>The program written in Python 3 is as follows;</em>
<em>The program does not make use of comments; however, see explanation section for detailed line by line explanation of the program</em>
num = int(input("Number of Inputs: "))
mylist = []
userinput = int(input("Enter a digit: "))
i = 1
while i < num:
mylist.append(userinput)
userinput = int(input("Enter a digit: "))
i += 1
try:
first7 = mylist.index(7)+1
print('The first position of 7 is ',first7)
last7 = num - 1 - mylist[::-1].index(7)
print('The last position of 7 is ',last7)
except:
print('7 is not on the list')
Explanation:
This line prompts user for the number of inputs
num = int(input("Number of Inputs: "))
This line declares an empty list
mylist = []
This line inputs the first number into the empty list
userinput = int(input("Enter a digit: "))
The italicized lines represent an iteration that allows user to input the numbers into the empty list.
<em>i = 1</em>
<em>while i < num:</em>
<em> mylist.append(userinput)</em>
<em> userinput = int(input("Enter a digit: "))</em>
<em> i += 1</em>
The try-except is used to check the presence of 7 in the list
try:
This checks the first occurrence of 7
first7 = mylist.index(7)+1
This prints the first occurrence of 7
print('The first position of 7 is ',first7)
This checks the last occurrence of 7
last7 = num - 1 - mylist[::-1].index(7)
This prints the last occurrence of 7
print('The last position of 7 is ',last7)
The following is executed if there's no occurrence of 7
except:
print('7 is not on the list')
See Attachments for sample runs
Answer:
Explanation:
The objective of this program we are to develop is to compute a C++ program and a flowchart that calculates a cost to replace all tablets and desktop computers in a business.
C++ Program
#include<iostream>
#include<iomanip>
using namespace std;
/*
⦁ // Name:
⦁ // Date:
⦁ // Program Name:
⦁ // Description:
*/
int main()
{
const double SalesTaxRate = .075, DiscountPercent = .10, FinanceCharge = .15;
const double TABLET = 320.00, DESKTOP = 800.00;
double total = 0.0, subTotal = 0.0,avg=0.0;
int numberOfTablets, numberOfDesktop;
cout << "-------------- Welcome to Computer Selling Company ------------------ ";
cout << "Enter number of tablets: ";
cin >> numberOfTablets;
cout << "Enter number of desktops: ";
cin >> numberOfDesktop;
subTotal = TABLET * numberOfTablets + numberOfDesktop * DESKTOP;
char choice;
cout << "Paying cash or financing: (c/f): ";
cin >> choice;
cout << fixed << setprecision(2);
if (choice == 'c' || choice == 'C')
{
cout << "You have choosen paying cash." << endl;
total = subTotal - subTotal * DiscountPercent;
cout << "Discount you get $" << subTotal * DiscountPercent<<endl;
cout << "Sales Tax: $" << SalesTaxRate * total << endl;
total = total + total * SalesTaxRate;
cout << "Total computers' Cost: $" << total << endl;
avg = total / (numberOfDesktop + numberOfTablets);
cout << "Average computer cost: $ " << avg << endl;
}
else if (choice == 'f' || choice == 'F')
{
cout << "You have choosen Finance option." << endl;
total = subTotal + subTotal * FinanceCharge;
cout << "Finance Charge $" << subTotal * FinanceCharge << endl;
cout << "Sales Tax: $" << SalesTaxRate * total << endl;
total = total + total * SalesTaxRate;
cout << "Total computers' Cost: $" << total << endl;
avg = total / (numberOfDesktop + numberOfTablets);
cout << "Average computer cost: $ " << avg << endl;
}
else
{
cout << "Wrong choice.......Existing.... ";
system("pause");
}
//to hold the output screen
system("pause");
} }
OUTPUT:
The Output of the program is shown in the first data file attached below:
FLOWCHART:
See the second diagram attached for the designed flowchart.
