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Arrays Pointers and Functions II

Posted on 2004-10-19
Medium Priority
248 Views
I am trying to learn about pointers and arrays. In this program I playing with several concepts, however, I dont have the funtion right (I only included 1 of several). What am I doing wrong? Thanks much, Annie
#include <iostream>
#include "inputarray.cpp"
/*struct input{double numCostPerPart; int numPublished;
//double numSalCost; int numSold; double numRoyalPercent;
double numHolePrice;};*/
#include "outputarray.cpp"
/*struct output
{double numTotalCost; double numSalValue; double numGrossProfit;
double numRoyalty; double numProfit;};*/

using namespace std;
const int SIZE =3;
void makeCalculations(input ainput[], int nSize);

int main()
{
int n;

input ainput[SIZE];    //declare array input
output aoutput[SIZE];  //decalre array output

for(n=0; n<SIZE; n++)  //loops  array
{
cout<<endl;

cout<<"Enter cost of parts: ";
cin>>ainput[n].numCostPerPart;
cout<<"Enter number of parts published: ";
cin>>ainput[n].numPublished;
cout<<"Enter salvation cost of parts: ";   //inputs
cin>>ainput[n].numSalCost;
cout<<"Enter number of parts sold: ";
cin>>ainput[n].numSold;
cout<<"Enter Royalty Percentage: ";
cin>>ainput[n].numRoyalPercent;
cout<<"Enter wholesale cost of parts: ";
cin>>ainput[n].numHolePrice;
}
cout << endl;
makeCalculations(ainput, 1);

for( n=0; n<SIZE; n++)  //loops  output array

{
cout << "Total Cost"<<aoutput[n].numTotalCost<<endl;
cout <<"Salvation Value" <<aoutput[n].numSalValue<<endl;   // outputs
cout <<"Gross Profit" << aoutput[n].numGrossProfit<<endl;
cout <<"Royalty" << aoutput[n].numRoyalty<<endl;
cout <<"Profit" << aoutput[n].numProfit<<endl;
}
system("pause");
return EXIT_SUCCESS;
}

void makeCalculations(input ainput[], int nSize)
{

double totalCost = 0;

for (int n = 0; n < nSize; ++n)
{
totalCost += ainput[n].numCostPerPart;

}
ainput[n].numCostPerPart* totalCost;
}
0
Question by:bananaamy
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LVL 4

Expert Comment

ID: 12354641
Hi bananaamy,

I found many errors in the code. It seems to be written in Dev-C++ (just a thought). In the function why is the line 'ainput[n].numCostPerPart* totalCost;' out of the for loop? I think it should be calculated as a part of the loop. The error comes because the 'n' used in the line is finishes as soon as the loop finished. So, I take it inside the loop.

Please explain the problem that you are facing. Are you getting wrong results??

Cheers!
0

LVL 17

Expert Comment

ID: 12355381
Your makeCalculations doesn't store totalCost anywhere.

Try changing...

ainput[n].numCostPerPart* totalCost

...to...

ainput[n].numCostPerPart = totalCost;

Note also that you are passing size as 1 to this fnction in the calling code, which means that it will only operate on the first index of the array.
0

Author Comment

ID: 12356499
I am trying to learn this languge and have been experimenting with it for about 4 weeks. What I am tring to do is to see how  several things work together(pointers,arrays and functions). . I want to enter in data into an "input array" a specific amount of times,  I then want to pass the value to a function, preform several calculations, and pass the value of the output of that function to the "output array". I want the output array to display the answers to my calculations. What  I cant figure out is  how to make my functions work with pointers.
0

LVL 17

Accepted Solution

rstaveley earned 2000 total points
ID: 12358432
Start by passing your output array as a parameter to makeCalculations. When you pass an array as a parameter to a function, it is "passed by reference", which means that your function isn't passed a copy of the array, it is passed a reference to the array itself.
0

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