Can anybody help me with the equations for this problem?

**Perspolice1993** · 09-22-2011

Basically I need to find the minimum number of packages I need which is the cheapest price.

I did a*price_small+b*price_large= total cost

and 200*a+ 50*b = total_invitations

but since I have to use if statements as well as while loops I don't know how to find the minimum of each. Hope one of you can help.

Arup wants to just send a free E-vitation to all of his guests for his wedding, his fiancee will have none of it. She has put her foot down and has insisted that they mail out regular invitations. After doing some research, Arup found out that depending on the size of the packages of invitations ordered, there are different prices. He wants you to figure out how many of each package to order, in order to get enough invitations to mail out at the cheapest price. For the purposes of this problem, there are only two packages:

1) One with 50 invitations
2) One with 200 invitations

Each vendor has a different price for the two packages. You’ll ask the user to input these two prices, as well as the total number of invitations that need to be sent out. Your job will be to calculate how many of each package to buy for the best deal, and how much will be spent on invitations.

**anduril462** · 09-22-2011

This is very similar to your steak and chicken dinner problem from this thread: Help Needed On A Program.

Did you not read the homework policy then? Did you not learn anything from all the help you got? How about you reread that thread, and the thread Adak linked you in post #18 on that thread, and take another stab at it -- a serious one this time. I'm not getting the impression you like to do work for yourself.

If you don't know how if statements and while loops work, check out our tutorials and Google some more tutorials. Find a good book and read it.

**Perspolice1993** · 09-22-2011

there is 3 part to this assignment, I have done 2 parts, its just this one, I can't seem to get the equations right.

are the equations I used right? I know there are more steps but are they right.

**AndrewHunter** · 09-22-2011

Originally Posted by Perspolice1993

there is 3 part to this assignment, I have done 2 parts, its just this one, I can't seem to get the equations right.

are the equations I used right? I know there are more steps but are they right.

This is a simple min/max problem. I would suggest you google how to solve these mathematically so you understand what the process is, prior to attempting to code a solution. Until you know how to do it on paper, you will never be able to program it.

**anduril462** · 09-22-2011

Originally Posted by Perspolice1993

there is 3 part to this assignment, I have done 2 parts, its just this one, I can't seem to get the equations right.

I don't care if you already did the other two parts. This is the part you have questions on, this is the part you must show serious effort and initiative on if you want serious help.

are the equations I used right? I know there are more steps but are they right.

Nobody knows if your equation is right because we can't read your mind and you didn't tell us what a and b represent. You aren't thinking about your problem and you aren't trying much on your own. You came up with one equation, and ran here to ask us if you're right. Did you plug in some numbers and see what you get? Do those answers make sense? Your previous assignment had a sample run of the program that you could use to check if you are right. How about this assignment? Does it have any sample runs? Did you plug in those numbers and check?

**Perspolice1993** · 09-22-2011

I did work on it for 2 hours.

**Strahd** · 09-22-2011

Originally Posted by Perspolice1993

So don't post on this threat if you're gonna be a jerk. Just go to the beach and surf instead. Retard!!!

It is not smart to bite the hand of and/or insult members of the board. It is a sure way to get your thread locked, and I am 100% sure there are rules about reopening locked threads will result in something you will not like.

**quzah** · 09-22-2011

This is a pretty simple problem:

1) One with 50 invitations
2) One with 200 invitations

Unless the one with 50 is less than 1/4th the price of the one with 200, you should use the 200 one as often as you can. The rest is just basic division.

Quzah.

**Perspolice1993** · 09-22-2011

sorry if I insulted, its just that moment I was somewhat ........ed cuz he was being a smart butt. But quzah I did come up with that conclusion, but I thought it was wrong for some reason. because I was gonna do if statement in that situation.

I don't know I was probably over thinking it.

**Adak** · 09-22-2011

Edit: Quzah has beat me to it.

Calm down Perspolice, please. Edit your post of the name calling, right away, OK?

Your problem is just another exercise in using the "solving two unknowns, by solving first for one unknown, in terms of the other one, and then solving the whole thing".

I think of this as an algebra problem, but if you are good at arithmetic, it can be solved that way, as well. I prefer algebra, but my C code, prefers arithmetic.

Why don't you post up the exact assignment you're working on, because that will help make it clearer to me. I read your first post, but the parameters of the problem just weren't clear to me, from that.

So, I might be wrong, but it sure sounds like a repeat of the same type of problem as the Steak and Chicken Dinner problem. But post up the assignment word for word, and let's see if it is.

And what the right equation(s) would be, if possible.

**Perspolice1993** · 09-22-2011

hey adak here is the url, is there anyway we can chat about this somewhere else, like on an instant messaging program. Do you have skype? if you do add me JayHakimi1, I will be on

**~~CommonTater~~** · 09-22-2011

Originally Posted by Perspolice1993

there is 3 part to this assignment, I have done 2 parts, its just this one, I can't seem to get the equations right.

are the equations I used right? I know there are more steps but are they right.

If problems this simple are giving you fits of temper and stressing you to no end what are you going to do when the really hard stuff comes along?

Tell ya what... people here volunteer their time to help people with problems in C program code.

We're not here to teach you math or train you in problem solving.

**Perspolice1993** · 09-22-2011

then my question is if you're not here to help people in problem solving, then what is the point of this site?

**Strahd** · 09-22-2011

Originally Posted by Perspolice1993

then my question is if you're not here to help people in problem solving, then what is the point of this site?

This site is to help programmers with questions about programming. As in strlen() is returning a size of 3 but I obviously have 6 things in there and here is my code.

The problem you are having is, you need to pull out the pen and paper and SOLVE the problem using math.

A IF statement evaluates if something is TRUE or FALSE, if the statement is true then do X code, else do Y code. Example if you come to a price you cannot do it can look like

Code:

if (price <= 500) //buy box1
else //buy box 2

Originally Posted by CommonTater

If problems this simple are giving you fits of temper and stressing you to no end what are you going to do when the really hard stuff comes along?

Tell ya what... people here volunteer their time to help people with problems in C program code.

We're not here to teach you math or train you in problem solving.

You know, I wish I was doing the write this function to solve this math problem...

Buuut noo I get to play with malloc, the meat and bones of C

**Shawn Belcher** · 09-22-2011

We help in C and C++ not math, thats not to say we wont help you, we will if need be, but the site is not for it.
there are plenty of good sites for that
Khan Academy if you don't know what to do.
and if you need a forum just Google math forums.

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