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Dec 21st, 2004

can anyone assiat in getting my function to work?

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Hello from what i can understand about function is that you need the prototype , then you need some kind of call function in the program and then the delcared function. Well I've done that but it doesnt want to work

Quote ...

#include <iostream>
#include <ctime>
#include <cstdlib>

using namespace std; // for std::cin, std::cout etc.
void f1();
int main()
{

int cointoss, heads = 0, tails = 0;

srand(time(0));

for (int counter = 0; counter <= 10; counter++)
{
cointoss = 1 + rand() % 2;
if (cointoss == 1)
{
cout << "Heads" << endl;
heads++;
}
else
{
cout << "Tails" << endl;
tails++;
}
}
cout << "there are a total of " << heads << " heads";

cout << " and " << tails << " tails" << endl;

f1();

cin.get(); // wait
return 0;
}

void f1(int i)
{

return heads - tails;

}

basically the function is ment to take the total of Heads and takewaya the total tails, stored at int tails and int heads but it doesnt want to excuted!

Would be reatful for assistance.

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Acidburn

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Dec 21st, 2004

Re: can anyone assiat in getting my function to work?

You declared the function f1 as

C Syntax (Toggle Plain Text)
void f1 ();
void f1 ();

but the definition specify that the function receive one parameter:

C Syntax (Toggle Plain Text)
void f1 (int i)
{
...
}
void f1 (int i)
{
...
}

And, also, the return value is of void type.

As you say, the function has to return the difference between 2 variables, so it should have 2 parameters, and return an int value:

C Syntax (Toggle Plain Text)
int f1 (int a, int b);
int f1 (int a, int b);

frrossk

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Dec 21st, 2004

Re: can anyone assiat in getting my function to work?

thanks for the reply so if your trying to make a protoype that takes more than 1 argument you must tell it? And if your returning something to the main() you should also have "int" . I guess I'm learning

However in my prototype i have heads - tails, which should get the values from the head - tail in the int main() but instead i get a compile error saying head tail not declared!

Acidburn

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Dec 21st, 2004

Re: can anyone assiat in getting my function to work?

You declared the head and tail variables inside of main function; they are not available for the f1 function.
When you declare a function, it should work like this:

C Syntax (Toggle Plain Text)
int f1 (int a, int b)
{
int res;
res = a - b;
return res;
}
int f1 (int a, int b)
{
int res;
res = a - b;
return res;
}

In main, it should be:

C Syntax (Toggle Plain Text)
int main ()
{
int head, tail;
.....
printf ("%d", f1 (head, tail));
}
int main ()
{
int head, tail;
.....
printf ("%d", f1 (head, tail));
}

Clear enough?

frrossk

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Dec 21st, 2004

Re: can anyone assiat in getting my function to work?

hello, ok could i make a prototype that took the values stored at int heads and tails, if i made them both global not local? that way could i just put the little calculation in the prototype?

like

int heads;
int tails;

int main()
int toss;

....make a statment that randomizes input to toss and stored the results at toss, and incrmements heads or tails depending on the value (1 or 2). is this possible since its outside the local varibles....

Acidburn

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Dec 21st, 2004

Re: can anyone assiat in getting my function to work?

sorry about the double post but it seems we cant edit them!! Well i got it working by using void!

Acidburn

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