
June 18th, 2009, 01:47 PM
#1
[Help]Pointers with Functions Problem!
I keep getting this error on line 39, as well as some others.
error C2296: '*' : illegal, left operand has type 'double (__cdecl *)(double *)'
I have no idea how to fix it, it gives me the same errors when I don't use the pointers and at this point I can't see a work around.
Any help at all would be appreciated.
Code:
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
double taxOne(double* grossIncome);
double taxTwo(double* grossIncome);
//double airTax(double taxOne, double taxTwo, double grossIncome);
int main()
{
char loopIndicator = 'Y';
int sinNum = 0;
double grossIncome = 0;
double* pgrossIncome = &grossIncome;
double airTax = 0;
while(loopIndicator == 'Y'  loopIndicator == 'y')
{
cout << "Enter your SIN number: ";
cin >> sinNum;
cout << "Enter your gross income: ";
cin >> grossIncome;
//calculation stuff goes here
if(grossIncome > 50000)
{
cout << "Total income tax is " << taxOne(&grossIncome);
airTax = taxOne * 0.07;
cout << endl << "Air tax is " << airTax;
}
else
{
cout << "Total income tax is " << taxTwo(&grossIncome);
}
cout << endl << "Would you like to enter another? Y/N: ";
cin >> loopIndicator;
if(loopIndicator == 'N'  loopIndicator == 'n')
{
break;
}
}//end while
return 0;
}//end main
//Function to compute income tax if grossIncome > 50000, tax is .47%
double taxOne(double* &grossIncome)
{
double result = &grossIncome * 0.47;
return result;
}//end function
//Function to compute income tax if grossIncome < 50000, tax is .44%
double taxTwo(double* &grossIncome)
{
double result = &grossIncome * 0.44;
return result;
}//end function

June 18th, 2009, 02:06 PM
#2
Re: [Help]Pointers with Functions Problem!
It would be easier if you pointed to a line that generated an error.
Code:
airTax = taxOne * 0.07;
taxOne is a function name. How can you multiply it by anything?
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June 18th, 2009, 02:43 PM
#3
Re: [Help]Pointers with Functions Problem!
Well, what I need this to do is :
Take taxOne(or taxTwo depending on the income), and multiply it by 0.07% to get the airTax value.

June 18th, 2009, 02:47 PM
#4
Re: [Help]Pointers with Functions Problem!
Reverting back to what I had before:
Code:
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
double taxOne(double grossIncome);
double taxTwo(double grossIncome);
//double airTax(double taxOne, double taxTwo, double grossIncome);
int main()
{
char loopIndicator = 'Y';
int sinNum = 0;
double grossIncome = 0;
double airTax = 0;
while(loopIndicator == 'Y'  loopIndicator == 'y')
{
cout << "Enter your SIN number: ";
cin >> sinNum;
cout << "Enter your gross income: ";
cin >> grossIncome;
//calculation stuff goes here
if(grossIncome > 50000)
{
cout << "Total income tax is " << taxOne(grossIncome);
//airTax = taxOne * 0.07;
//cout << endl << "Air tax is " << airTax;
}
else
{
cout << "Total income tax is " << taxTwo(grossIncome);
}
cout << endl << "Would you like to enter another? Y/N: ";
cin >> loopIndicator;
if(loopIndicator == 'N'  loopIndicator == 'n')
{
break;
}
}//end while
return 0;
}//end main
//Function to compute income tax if grossIncome > 50000, tax is .47%
double taxOne(double grossIncome)
{
double result = grossIncome * 0.47;
return result;
}//end function
//Function to compute income tax if grossIncome < 50000, tax is .44%
double taxTwo(double grossIncome)
{
double result = grossIncome * 0.44;
return result;
}//end function
//Function to compute air tax
double airTax(double taxOne, double taxTwo, double grossIncome)
{
if(grossIncome > 50000)
{
double result = taxOne * 0.07;
return result;
}//end if
else
{
double result = taxTwo * 0.07;
return result;
}//end else
}//end function
How would i make my airTax function display? It gives me an error whenever I put the cout << airTax(taxOne, taxTwo, grossIncome).

June 18th, 2009, 02:52 PM
#5
Re: [Help]Pointers with Functions Problem!
Code:
cout << airTax(taxOne(grossIncome), taxTwo(grossIncome), grossIncome) << endl;
Kurt

June 18th, 2009, 03:02 PM
#6
Re: [Help]Pointers with Functions Problem!
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