“Who Doesn’t Love a Discount?” (Do...while)

Question

A supermarket has launched a campaign offering a 15% discount on 3 items.
Write a program that takes the total price for every purchase as input and outputs the relevant discount.

Sample Input
15000
4000
6700

Sample Output
2250
600
1005

Explanation
2250 represents a 15% discount for a 15000 purchase; 600 for 4000 and 1005 for 6700 accordingly.
https://code.sololearn.com/cQd6RpWHZTMY/?ref=app

Answer 1

Hai Tahiti🍷...
I corrected your errors in your coding...
Check it

https://code.sololearn.com/cPnLf0m3g4BR/?ref=app

Answer 2

Yes, I forgot about that totally.

Maybe you can do this without array at all. Look at this pseudo and try to implement it in code.

Let <i> be 0
Begin loop
Read value for <purchase_amount>
Print 15% of <purchase_amount>
Increment value of <i>
While <i> < 3

Answer 3

Tahiti🍷
It's okay, don't mind it. You have got a working solution after all 👍

Answer 4

Here is my code for the problem, it starts by printing the 3 values correctly, but it just keeps printing the last value over and over again. Anyone know a solution for this?

#include <iostream>
using namespace std;

int main()
{
int purchaseAmount = 0;
int totalPrice;

//your code goes here

do{
cin >> purchaseAmount;
totalPrice = purchaseAmount * 0.15;
cout << totalPrice << endl;
}
while(purchaseAmount >= 3);

return 0;
}

EDIT: I was able to fix it with these changes:

#include <iostream>
using namespace std;

int main()
{
int purchaseAmount = 0;
double totalPrice;

//your code goes here

do{
cin >> totalPrice;
purchaseAmount = purchaseAmount + 1;
totalPrice = totalPrice * 0.15;
cout << totalPrice << endl;
}
while(purchaseAmount < 3);

return 0;
}

Answer 5

Consider to save the 3 purchase into an array first (use a loop). Once the 3 purchase had been stored in array, then output the 15% discount of each array element also using a loop.

Answer 6

Ipang , I appreciate your help, although I did not understand the “pseudo”.

Answer 7

I don’t understand what’s wrong with my Line 11.

Answer 8

Ipang , I’m only on level 7, almost finished learning about Conditionals and Loops. I don’t know why the module would present a quiz question in which “array” must be used, without having taught yet about how to code an array. Is this the only way to code the program correctly? Thank you.

Answer 9

Tahiti🍷 Why did you add the post increment along with cin? I don't see a point in it, if it ever worked (as cin and ++ cannot be used simultaneously in C++). Var++ returns something else; not a variable. ++ only works if the value isn't changed before the increment happens. This means that you cannot simplify the code that way. Try:

cin >> var;
var++;

Let me know if I've typed anything incorrect.

Answer 10

K.Suhanya ,
Thank you. This worked. What I did (per your advice), was switch the cin and cout lines, then changed the (>= ) operator to simply <.
But I don’t understand why I had to use >.
I understood “purchaseAmount” as the number of items purchased. The customer must purchase at least 3 items. My logic therefore, was that while the purchase amount (number of items) is greater than or equal to 3, I want the program to output a 15% discount on the total price. 🤷🏽‍♀️

Answer 11

Calvin Sheen Thomas ,
I tried everyone’s advice in the order it was given. I’m very new to C++ (and coding in general), so I am not familiar with all the concepts, including “var.”

I didn’t mention this before, but at the bottom of the instructions for this exercise, was the following:

! Use cin inside the loop to get an input for every iteration.

I used purchaseAmount++ because I thought that I must increment the number of items this way, so that a minimum of three items would eventually be represented by the total price. I don’t know if that was the correct way to reason, but it actually worked.

Answer 12

Ipang , 👍😃

Answer 13

#include < iostream>
using namespace std;
int main()
{
int purchaseAmount = 0;
int totalPrice;
do {
cin >> totalPrice;
cout << ( totalprice * 0.15) << endl;
purchaseAmount = purchaseAmount + 1;
}
return 0;
}
👍👍
[15% = 15/10 = 0.15]

Answer 14

#include <iostream>
using namespace std;

int main()
{
float purchaseAmount = 0;
float totalPrice;
int item = 0;

do{
item += 1;
cin>> purchaseAmount;
totalPrice = purchaseAmount*0.15;
cout<<totalPrice<<endl;
}
while(item < 3);

//your code goes here

return 0;
}