srand troubles

[NerdTastic]

#include <iostream.h>
#include <windows.h>
#include <time.h>



int x, y, z, a, b, c;
int numbers[200];

srand(time(NULL));

I'm being told:

g:\c++\2004_two\2004_two.cpp(11) : error C2501: 'srand' : missing storage-class or type specifiers
g:\c++\2004_two\2004_two.cpp(11) : error C2373: 'srand' : redefinition; different type modifiers
c:\program files\microsoft visual studio\vc98\include\stdlib.h(308) : see declaration of 'srand'

Anybody know why?

[Disch]

1) you must #include <cstdlib> (or <stdlib.h> if this is C)

2) You can't have executable code outside of a function (usually). Put the srand call inside your main() -- don't have it global

[NerdTastic]

Thanks!

[Moschops]

#include <iostream.h>

I'd guess from this horrifically ancient header that the OP is using a decade-old compiler, in which case #include <cstdlib> might have to be #include <cstdlib.h> .

Please, get a compiler that conforms to at least one of the C++ standards.

Edit: I see from other threads that you do indeed have some kind of FrankenCompiler that accepts code that isn't C++. You're doing yourself no favours by learning ... whatever it is that you're learning. :)

[NerdTastic]

@Moschops, lol, it's Visual c++ 6.0 enterprise, it sucks. I have express 2012 at home, but at school they make me use 6.0

[Moschops]

And indeed, why not. Why should the education system teach you modern (correct) C++ using free tools far better than VS6, when they could cripple your abilities instead? Marvellous.

[NerdTastic]

@Moschops agreed. So, apologies for what appears to be frankencode. it is.

I was just told that my void{ } had a syntax error "}" I hate this compiler.

[NerdTastic]

Sorry to resurrect this post. Same program, new dumb problem.

//MAIN

void main()
{

    srand(time(NULL));

	x=0;

	do
	{
		numbers[x]=rand() % 1000+1;

		y=0;

		do
		{

			if(numbers[x]==numbers[y])
			{x--; break;}

			y++;

		}while(y<x);

		x++;
	}while(x<200);


	//Least to greatest

	LTG_bubble_sort(x);

	//Cout

	y=0;

	do
	{
		y=0;

		do
		{
				cout << numbers[y] << "   ";
				y++;
		}while(y<10);

		cout << '\t';
	}




}

G:\C++\2004_two\2004_two.cpp(100) : error C2059: syntax error : '}'

I can't figure out why.

[Moschops]

void main()
Not C++. C++ demands int main()

Your final do is missing its while.

[NerdTastic]

Why does c++ demand int main()? I'll change it, I'm just wondering. Thanks on the do-while.

[Moschops]

The simple answer is because the actual definition of C++, ISO IEC 14882-2011 (and earlier versions), section 3.6.1.2 states

It shall have a return type of type int

[NerdTastic]

Is that written on stone tablets? :P okay haha

[Disch]

programs output a value to the OS on exit. This can be useful in batch files to know whether a program completed its job successfully, which can abort the script (ie, a compiler returning a failure code will let the build script know that it shouldn't try to run the linker)

main has to return an int to give the OS that code.

[NerdTastic]

So are void functions okay for the others? it's only main that returns a value to the OS right?