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valentinak56 [21]
3 years ago
12

A simple system is to be designed to allow for the selling of old books. There are two different types of users: buyers and sell

ers. All users are registered externally from the system. The sellers can post information on the books they have for sale and remove the books once they are sold. Buyers can search the system and then contact a seller offline if they want to make a purchase.
Using problem 1, draw the UML Use Case Diagram, and write the stories for each use case above.

Computers and Technology
1 answer:
Sidana [21]3 years ago
3 0

Answer:

The  UML diagram and the story is shown on the first uploaded image

Explanation:

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6
Mama L [17]

Answer:

=IF(D3>50; E3; F3) and =IF(A1>60;"Pass";"Fail") are valid IF formulas.

Explanation:

P.S - The exact question is -

To find - Select the correct answer from each drop-down menu. Which IF formulas are valid? _____ and _____ are valid IF formulas.

FIRST BLANK

=IF(D3>50; E3; F3)

=IF(D3>50);( E3; F3)

=IF(10<5;23);("Incorrect")

SECOND BLANK

=IF(A1>60;"Pass";"Fail")

=IF(A1>60); ("Pass"; "Fail")

=IF(A1>60; ("Pass"; "Fail"))

Solution -

An IF structure is built following this pattern:

IF(TEST;IF TRUE;IF FALSE)

So,

The correct option is -

=IF(D3>50; E3; F3) and =IF(A1>60;"Pass";"Fail") are valid IF formulas.

7 0
3 years ago
Write a function DrivingCost() with input parameters drivenMiles, milesPerGallon, and dollarsPerGallon, that returns the dollar
posledela

Answer:

#include <iostream>

using namespace std;

double DrivingCost(int drivenMiles,double milesPerGallon,double dollarsPerGallon)

{

   double dollarsperMile=dollarsPerGallon/milesPerGallon;//calculating dollarsperMile.

   return dollarsperMile*drivenMiles;//returning thr driving cost..

}

int main() {

double ans;

int miles;

cout<<"Enter miles"<<endl;

cin>>miles;

ans=DrivingCost(miles,20.0,3.1599);

cout<<ans<<endl;

return 0;

}

Output:-

Enter miles

10

1.57995

Enter miles

50

7.89975

Enter miles

100

15.7995

Explanation:

In the function first I have calculated the dollars per mile and after that I have returned the product of dollarspermile and driven miles.This will give the cost of the Driving.

4 0
3 years ago
g Create a program that reads a list of states from an input file, puts them in order, and displays the sorted list to the user.
mixas84 [53]

Answer:

Check the explanation

Explanation:

# Step 1

the first thing to execute will be......

f = open("states.txt")

# Step 2

the second step is......

states = []

for line in f:

   states.append(line.strip())

# Step 3:

the third step is to......

for state in sorted(states):

   print(state)

f.close()

3 0
3 years ago
Write a program whose input is a character and a string, and whose output indicates the number of times the character appears in
nevsk [136]
Here is a Python program:

tmp = input().split(' ')
c = tmp[0]; s = tmp[1]
ans=0
for i in range(len(s)):
if s[i] == c: ans+=1

# the ans variable stores the number of occurrences
print(ans)
5 0
3 years ago
Data entered in a cell will appear in the bar, found about the worksheet
Setler79 [48]

Answer:

formula bar

Explanation:

The formula bar in Excel is located next to the name box

and above the worksheet area. It displays the data stored in

the active cell. The formula bar is used to view, enter, and

edit values and formulas in cells.

3 0
3 years ago
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