Function Prototype problem

I have a very generalized, very basic idea of how function prototypes work, but I am stuck on setting them up to work for my program.

Can anyone help??

Yes.
Help us, help you.

gg

Code:

---

#include <stdio.h>

//This is a function prototype
void welcome();    //Don't forget the semi-colon

int main( void )
{
    welcome();    //Here we call the function

    return 0;
}

//This is a function implementation
void welcome()    //Notice that there's no semi-colon
{
    printf( "Welcome to the wonderful world of functions!" );
}

---

The only reason that the implementation is below main(), is to add structure to the source file. C/C++ programmers usually write the function implementations after main().

Code:

---

#include <iostream>
#include <iomanip>

using std::cout;
using std::endl;
using std::setw;
using std::cin;

int main ()

{
int car1 = 0;
int car2 = 0;
int car3 = 0;
int hours = 0;
double totalhours = 0;
double calculatetotal = 0;
double calculatecharges = 0;
       
          cout << "Enter the number of hours parked for three cars: ";
       
  for ( int x = 1; x <= 3; x++ )
      cin >> x;
          cout << "\nCar" << setw(13) << "Hours" << setw(21) << "Charge";
          cout << "\n  1" << setw(11) << car1 << setw(21) << calculatecharges;
          cout << "\n  2" << setw(11) << car2 << setw(21) << calculatecharges;
          cout << "\n  3" << setw(11) << car3 << setw(21) << calculatecharges;
      cout << "\n Total" << setw(11) << totalhours << setw(21) << calculatetotal << endl;

return 0;

}

---

The user is supposed to enter in three sets of numbers using for statements, which is why I included the for (int x =1) statement. And that value is supposed to be displayed under hours. And from there I will have to calculate the charges.

I don't expect anybody to finish the code - because I need to learn.

I just need a nudge in the right direction.

You can't get input and display the results at the same time.
If you want to have multiple statements inside a for loop, then you have to use braces:

Code:

---

for (...)
{
  statement1;
  statement2;
  statement3;
}//for

---

You almost have the loop for displaying results. Get rid of the "cin >> x;" and use braces with your for loop. Then move the first cout line outside the for loop (you don't want to print the header 3 times).
Once you have your ouput looking good, work on the input loop.

If part of the requirement is that you get your input using a loop, then you'll want to use an array instead of car1, car2, and car3.

gg

Basically, you'll need to write a function to calculate the charges for you. You need to pass a value to the function and return a value from the function.

Here's a function that calculates the product of two numbers and returns the result.

Code:

---

#include <iostream>

using std::cout;

//The prototype : We are passing two integer values to the function, and we are returning an integer
int product( int a, int b );

int main()
{
    //Here's how we'd use it
    int prod = product( 5, 6 );

    cout << prod;

    return 0;
}

//Implementation
int product( int a, int b )
{
    int result = a * b;

    return result;
}

---

Now, what you need to do is write a function to calculate the values that you need from the input that you get, iow the total hours, charges etc.

Let me try again (now that I see your code differently).

You don't want to get input into your loop variable. Here is a simple example:

Code:

---

const int SIZE = 3;
int a[SIZE];
int n;

//input loop
for (n = 0; n < SIZE; n++)
{
    cout << "Enter a number: ";
    cin >> a[n];
}//for

//output loop
for (n = 0; n < SIZE; n++)
{
    cout << "Number " << (n + 1) << " is " << a[n] << endl;
}//for

---

gg

is there any way to have a for input loop to print on the same line?

I.e

Enter number: 1 2 3

Number 1 is 1
Number 2 is 2
Number 3 is 3

Based on Codeplug's code how can you add the total number entered i.e

Enter hours: 8 1 9

Car Hours
1 8
2 1
3 9
Total 18

EDIT: Still searching for the above answer but I am editing the post to ask another question.

Code:

---

#include <iostream>
#include <iomanip>

using std::cout;
using std::cin;
using std::setw;
using std::endl;

int main ()
{
double calculatecharges = 0;
double calculatetotal = 0;
int totalhours = 0;


const int SIZE = 3;
int a[SIZE];
int n;

//input loop
for (n = 0; n < SIZE; n++)
{
    cout << "Enter the hours parked for three cars: ";
    cin >> a[n];
}//for

    cout << "\nCar" << setw(11) << "Hours" << setw(19) << "Charge";

//output loop
for (n = 0; n < SIZE; n++)
{
    cout << "\n  " << (n + 1) << setw(9) << a[n] << setw(19) << calculatecharges;
 
}//for

    cout << "\n Total" << setw(6) << totalhours << setw(19) << calculatetotal << endl;

        if ( a[n] <=3)
                calculatecharges = 2;

return 0;
}

---

This is where I stand now. Can anyone help answer or lead me in the right direction to achieve my goal?

Thanks in advance