how to print and save?

I suggest that you post your current code. Indent it more consistently, please.

here's my current code..

Code:

#include<stdio.h>
float enter_hours(float w);
float calculateCharges(float x,float y);

int main ()

{

 for (int count=1;count<=3;count++);
 {
	float a;
	float p;
	float q;

	printf("Car\tHours\tCharges\n");
	printf("%d\t%.1f\t%.2f",count,enter_hours(a),calculateCharges(p,q));
	count++;
 }
return (0);
}

float enter_hours(float w)
{
  scanf("%f",&w);
  return w;
}

float calculateCharges(float n,float x)
{
  if (x<=3){
  return 2.00;
  }

  if (x>3 && x<24){
  n=x-3;
  return 2.00+0.50*n;
  }

  if (x==24){
  return 10.00;
  }
 return x;
}

You should use variable names that are more descriptive.

The main problem at this point is that you are reading in the input while calculating and printing the output. You probably should be reading the input into an array, then do the calculation and output using the array.

but i really don't understand..

the things that you have kindly explained to me seems so hard for me to interpret...

i can hardly understand what you are talking..

i'm so sorry..

could you explain or show me what should i do to undo these warnings...?

"possible use of 'p' before definition in main ()"

thanks..

Code:

float enter_hours(float w)
{
  scanf("%f",&w);
  return w;
}

Why do you pass w as a parameter? Do you use its value? No.
so it should be like that:

Code:

float enter_hours(void)
{
  float w;
  scanf("%f",&w);
  return w;
}

Code:

float calculateCharges(float n,float x)

What is n and what is x?

Shouldn't be only one input - number of hours spent on the parking?
Where do you initialize this value before calling your function?

What should be the output for 23.5 hours parking?

How do you transfer value returned by enter_hours to the calculateCharges?
Where do you calculate Total?

Originally Posted by vart

Code:

float enter_hours(float w)
{
  scanf("%f",&w);
  return w;
}

Why do you pass w as a parameter? Do you use its value? No.

yes.. i did use it.. w supposed to be hours input by user..
it is used to calculate the charge..

What is n and what is x?

i posted the question on other thread titled "assistance in function"...

please have a look at there and it may kind of explain most of the things you have asked..

Shouldn't be only one input - number of hours spent on the parking?

there are 3 cars to be included in the systems..

What should be the output for 23.5 hours parking?

2.00 + (23.5-3)*0.50=12.25

How do you transfer value returned by enter_hours to the calculateCharges?
Where do you calculate Total?

i really don't know as i quite new in function..

i haven't do the part of total because i already encountered problems without doing the total part...

aren't you going to help me out...???

anyone..

please generously help out as i'm still very weak in c programming...

thanks...

People have daily lives, ya know. Be patient.

yes.. i did use it.. w supposed to be hours input by user..
it is used to calculate the charge..

It is inputted INSIDE this function - why do you make it a parameter?

please have a look at there and it may kind of explain most of the things you have asked..

I do not need your explanation. YOU need this explanation to understand YOUR errors

there are 3 cars to be included in the systems..

So what number of cars is doing in this formula:

Code:

2.00+0.50*n;

2.00 + (23.5-3)*0.50=12.25

so for 23h 30 min you will charge 12$ 50 cents and for 24h - 10$? Don't you see some contradiction here?

i really don't know as i quite new in function..

In most cases you do something like

Code:

float hours = 4.5;
float charge = calculate(hours);

....

float calculate(float hours_parked)
{
   if(hours_parked <= 3.0f) return 2.0f;
   if(...)
...
   return 10.0f;
}

So you firstly initialize a variable - in your case using
hours = get_hours();
call and only then pass it as a parameter to other function