#include <iostream>
#include <cmath>

using namespace std;
double findQuadratic(a, b, c);
{
double quadratic = (-b + sqrt(b2-4ac))/2a); --- Not right but will fix, this is temporary.
return quadratic;
}


int main()
{
double x2value, xvalue, constantvalue;
cout << "x2 coefficient value:" value:;
cin >> x2value;
cout << "x coefficient value: ";
cin >> xvalue;
cout << "constant value: ";
cin >> constantvalue;
double quadratic = findQuadratic(x2value, xvalue, constantvalue);
cout << "The roots are: " << quadratic;
cin.ignore();
cin.get();
return 0;
}

This is an example of a problem I had along with the current one, so you can see the setup. Had to find a way to utilize the quadratic equation (I didn't fill in the actual formula yet but the setup is there I think....)

What's your question?

How do I create a formula that will allow the user to input P and R and then allow me to choose for certain T values?
Do I create seperate functions for each T-Value. Not sure how to just change T given the amounts they input and get the values.

for user input, please see this http://www.cplusplus.com/forum/articles/6046/ , it shows you how to get user input as a string and then converting it to a number type. You just repeat this for P, r and T.
You don't need to create separate functions, just create one function that takes P, r and T as arguments, so you can compute A for any T value.

Hope this helped

/e can show actual code if you really can't manage it

This post was edited by m0hawk on Feb 19 2014 12:10pm

Please don't listen to this guy you are doing it the correct way.



Depends, you can submit to the function 8 times, each time hardcoding the time variable in ex:



Or you can also create an array of time and loop through them



If you can find a mathematical correlation between those numbers, say that they are all n*10 (10, 20, 30, 40, 50) you could also do



Although this will be harder with data sets that don't have a clear pattern.

If you are comfortable with arrays, I'd just input all your dates and loop through them. Simplest and cleanest way.

As for your formula you just need to create a function that accepts three(or more) variables.



Maybe I am not understanding, but I don't think you need the quad formula, you can simply do



Just woke up so I may be wrong.

This post was edited by AbDuCt on Feb 19 2014 02:46pm

I dont see what's wrong with my answer... I just showed him a cleaner way to handle user input and said he just needed one function with the three arguments just like you did in your answer

This post was edited by m0hawk on Feb 19 2014 03:44pm

How is grabbing a string from STDIN then converting a string to a double cleaner? You must be out of your mind if you think it is.

Well I figured it out and used very minimal help from here (no offense, not saying your help was bad or anything), so I'm very happy with myself
On my way to tech guru.

Did you even read the link i posted ? Using cin directly with a type other than string can cause undefined behavior when entering eg a letter instead of a number. Avoiding that is indeed "cleaner".

This post was edited by m0hawk on Feb 19 2014 11:50pm

You aren't wrong. std::cin does have a tendency to provoke input validation concerns. But there are ways around this without introducing strings. Especially for a beginner, let's not bog him down with things he hasn't learned yet.

The following will loop until the user enters an integer: