C++

Forum

 
For loop declared variable reference

rjc5261 (1)
Hello all. I'm writing a simple function to calculate the co-volume parameter for a mixture, but I can't seem to remember how to reference one of seven variables which need to be changed within a for loop:

Formula is http://i.imgur.com/KrAt5tK.png

I just hard declared my variables because I didn't feel like importing a file. My skills are very basic.

Basically I need to call on the p1,p2,p3...p7 and the b1,b2,b3...b7 in the loop.

It's been a while since I took this in school and I forget references/ pass-by references.

ignore the alphas, they're for another calculation...


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
 
#include <iostream>
#include <cmath>
using namespace std;

int main()
{

	double p1 = .6622;
	double p2 = .1194;
	double p3 = .100452;
	double p4 = .45966;
	double p5 = .05;
	double p6 = .011041;
	double p7 = .010941;

	double alphaa1=7213.656;
	double alphaa2=21837.76;
	double alphaa3=41018.38;
	double alphaa4=66442.81;
	double alphaa5=98975.62;
	double alphaa6=138886.7;
	double alphaa7=185115.3;
	
	double b1=.428865;
	double b2=.648426;
	double b3=.901549;
	double b4=1.159367;
	double b5=1.444116;
	double b6=1.746952;
	double b7=2.043129;

	double amix=0;
	double bmix=0;
	double x;
	double y;
	

	for (int i = 1;i<8;i++){
		y = //something along the lines of pi*bi
		bmix = bmix + y;
	}


Thanks in advance for any help and your time.
Last edited on
Hippogriff (727)
Put each type (p1-p7, b1-b7) into a seperate array/vector and access them through that?

http://www.cplusplus.com/doc/tutorial/arrays/
http://www.cplusplus.com/reference/vector/vector/

Up to you which one to use.
Topic archived. No new replies allowed.