Pointers

lyojarhhs · #1 21-Mar-2007, 21:51

My program has functions that need to be able to access data from each other. So basically, I need to know where to put the pointers, as much help as you could give me...

Also, my last function is supposed to loop the entire program over again if they answer yes, how do i do this?
thanks for your time.

CPP / C++ / C Code:

#include <stdio.h>

main()
{

get_employee_info();

ltb_calculation();

overtime_rate();

employment_insurance();

canada_pension_plan();

federal_taxes();

output_form();

loop();
 
}

get_employee_info()
{
int employee_number, gross_pay, week, rate, hours_worked, salary, weekly_salary;
char hourly_salary;

printf ("Please enter your employee number:\n");
scanf ("%d", &employee_number);

printf ("Please enter for which week ending (YYYYMMDD):\n");
scanf ("%d", &week);

getchar();

printf ("Please enter if you are an Hourly (h) or Salary (s) paid employee:\n");
scanf("%c", &hourly_salary); 


if( hourly_salary == 'h')
  { 
    
  printf ("Please enter your rate of pay:\n");
  scanf ("%d", &rate);
  printf ("Please enter the number of hours worked:\n");
 scanf ("%d", &hours_worked);
  
  weekly_salary= rate * hours_worked;
  gross_pay= weekly_salary * 52;     
  }
   
if (hourly_salary == 's')
 { 
   
  printf ("Please enter your annual salary:\n");
  scanf ("%d", &salary);
  weekly_salary= salary/52;
  gross_pay= salary;
  }
 } 
   
ltb_calculation() {
int deduction, ltb;
double grosspay;   

if ((grosspay / 100)  > 0)
{
ltb= grosspay / 100;
 if (ltb > 50)
 {
  
ltb == 50;

 }
deduction= ltb * 2;
grosspay= grosspay - deduction;
}
}
overtime_rate()
{
double hourly_salary,overtime_rate, overtime_hours, overtime_pay, grosspay;
double hours, rate;

if (hourly_salary == 'h' && hours > 44)
{overtime_rate= 1.5 * rate; 
overtime_hours= hours - 44; 
overtime_pay= overtime_hours * overtime_rate;
grosspay= grosspay + overtime_pay;
}
}
employment_insurance()
{
double ei, weekly_salary;

ei= weekly_salary * .014;
if (ei > 11.80)
{
ei= 11.80;
}
}
 
canada_pension_plan()
{
double deduction, grosspay, pension;

deduction= grosspay * .016;
pension= deduction * 700;  
}
 
federal_taxes()
{
double annual_salary, initial_amount, base_amount, additional_amount;
double remainder_amount, fed_tax, remainder, provincial_tax;
if (annual_salary < 20,000)
{
initial_amount= annual_salary * .16;
}
 
if (annual_salary >= 20,000)
{
base_amount= 20,000 * .16;
}
 
remainder= annual_salary - 20,000;

if (remainder >= 20,000)
{
additional_amount= 20,000 * .23;
}
 
remainder_amount= remainder * .29;

fed_tax= initial_amount + base_amount + additional_amount + remainder_amount;

provincial_tax= fed_tax *.47;
fed_tax= fed_tax + provincial_tax;
}
 
 
output_form()
{
char hourly_salary;
double deductions, net_pay, fed_tax, ei, ltb, pension, gross_pay;
int employee_no, week, rate, hours_worked, salary;

deductions= fed_tax + ei + ltb + pension;
net_pay= gross_pay - deductions; 


printf ("bob jones Payroll Systems\n");

printf ("102 Orfus Road, Downsview ON\n\n");

printf ("Employee Number:%d         For Week Ending:%d, employee_no, week\n\n");

if (hourly_salary == 's')
{
printf ("Salary Paid : %.2d, salary\n\n");
}
 
if (hourly_salary == 'h')
{
printf ("Hourly Rate:     %.2d       Hours Worked:   %d, rate, hours_worked\n\n"
}
 
printf("GROSS PAY:                                 %.2d, gross_pay\n\n");

printf ("DEDUCTIONS:\n");
printf ("Long Term Benefits:                          %.22d, ltb\n");
printf ("Employment Insurance:                       %.2d, ei\n");   
printf ("Canada Pension Plan:                        %.2d, pension\n");
printf ("Federal Tax:                               %.2d, fed_tax\n\n");

printf ("TOTAL DEDUCTIONS:                          %.2d, deductions\n\n");

printf ("NET PAY:                                    %.2d, net_pay\n");
}
 
loop()
{     
char response;

printf ("Would you like to enter more data? ( 'y' or 'n')\n");
getchar();
scanf ("%c", &response);

if (response == 'y')
return 1;
else     
return 0;
}

WaltP · #2 22-Mar-2007, 00:46

Start by reading the Guidelines
Also this about main()

You need to actually put a loop in main() in order to "loop the entire program over again," probably a do/while loop is best.

How much of the program works? Since we're coming in cold, you need to give us a little information, not just a couple hundred line of code and ask us to help fix it....

lyojarhhs · #3 22-Mar-2007, 13:07

I just don't know the way to pass the information given to one function to the next, and then so on... For example i need to pass the "gross_pay" from get_employee_info to the ltb function... i first declare the variable in main? and then where do the asterisks or ampersands go?
this is the part of the code i'm speaking about:

CPP / C++ / C Code:

get_employee_info()
{
int employee_number, gross_pay, week, rate, hours_worked, salary, weekly_salary;
char hourly_salary;

printf ("Please enter your employee number:\n");
scanf ("%d", &employee_number);

printf ("Please enter for which week ending (YYYYMMDD):\n");
scanf ("%d", &week);

getchar();

printf ("Please enter if you are an Hourly (h) or Salary (s) paid employee:\n");
scanf("%c", &hourly_salary); 


if( hourly_salary == 'h')
  { 
    
  printf ("Please enter your rate of pay:\n");
  scanf ("%d", &rate);
  printf ("Please enter the number of hours worked:\n");
scanf ("%d", &hours_worked);
  
  weekly_salary= rate * hours_worked;
  gross_pay= weekly_salary * 52;     
  }
   
if (hourly_salary == 's')
{ 
   
  printf ("Please enter your annual salary:\n");
  scanf ("%d", &salary);
  weekly_salary= salary/52;
  gross_pay= salary;
  }
} 
   
ltb_calculation() {
int deduction, ltb;
double gross_pay;   

if ((gross_pay / 100)  > 0)
{
ltb= gross_pay / 100;
if (ltb > 50)
{
  
ltb == 50;

}
deduction= ltb * 2;
gross_pay= gross_pay - deduction;
}
}

KenJackson · #4 22-Mar-2007, 13:32

Instead of this:

CPP / C++ / C Code:

get_employee_info()
{
    int employee_number, gross_pay, week, rate, hours_worked, salary, weekly_salary;
    char hourly_salary;

You could do this:

CPP / C++ / C Code:

get_employee_info(int *employee_number, int *gross_pay, int *week, int *rate,
                  int *hours_worked, int *salary, int *weekly_salary, 
                  char *hourly_salary)
{
//...

WaltP · #5 22-Mar-2007, 14:08

Looks like I completely wasted my time responding, and trying to help....

Hint taken.

ahbi82 · #6 23-Mar-2007, 14:44

Hi lyojarhhs,

First of all, do you know what a pointer is?
Well the answer in short is: It is pointing to the address of a variable or NULL (which points to nothing)

A value for a vairalble is stored at a certain memory address. In addition, a pointer is also a memory address, in which storing the address of the variable its pointing to.

For example:

CPP / C++ / C Code:

int x = 10   // for example x is stored in address 0x0001

/* '&' preceeding x means the address of x.
'*' has two meanings.
1) when using during declaration its means that its a pointer to a certain type.
2.) it is also a in-direction / de-referencing operator. */
int* x_ptr = &x   // so now x_ptr is storing 0x0001

// demo de0referencing
*x_ptr = 20;    so now x has the value 20.

One main advantage of using pointers is to passing by reference to functions instead of passing by value. And also to save resources as values need no be duplicated as passing by value. The later is more important in embedded systems where resources are limited.

Hope this helps!!!

admin · #7 24-Mar-2007, 21:01

Some off-topic discussions were moved to http://www.gidforums.com/t-13893.html.

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