newbie problem, could someone say what is wrong with this?

Complain:

Quote:

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lesson2.cpp:9: warning: ISO C++ forbids declaration of ‘main’ with no type

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My Code:

Code:

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#include <iostream>

using namespace std;

struct weapons_guns {
  int sniper,assaultrifle,shotgun; // arsenal
};

main() {
  weapons_guns guns; // activates? the structure weapons_guns as 'guns'
  weapons_guns *ptr; // defines the pointer weapon_guns.ptr or does it define weapons_guns as *ptr?

  guns.sniper = 100; // sets the weapons_guns.sniper too 100 ( ment to reflect price )
  ptr = &guns; // sets the pointer(ptr) too weapons_guns aka'guns' structure?
  cout<< ptr->sniper; // takes the output from weapons_guns.sniper with a pointer
                      // does it use 'weapons_guns' as *ptr too call weapons_guns.sniper?
  cin.get();
}

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Original, compiles fine:

Code:

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#include <iostream>

using namespace std;

struct xampl {
  int x;
};

int main()
{ 
  xampl structure;
  xampl *ptr;
 
  structure.x = 12;
  ptr = &structure; // Yes, you need the & when dealing with structures
                    //  and using pointers to them
  cout<< ptr->x;    // The -> acts somewhat like the * when used with pointers
                    //  It says, get whatever is at that memory address
                    //  Not "get what that memory address is"
  cin.get();                   
}

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as you can see they are very similar, i can't narrow down why I get that error..

Look at line 9. Notice how it talks about main. Look at the original, and find main there. Notice the difference.

Whoops!!!

And remember that main shall always return int (explicitly, as well), and never something else like void, like some tend to use.

Quote:

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Originally Posted by Elysia

And remember that main shall always return int (explicitly, as well), and never something else like void, like some tend to use.

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I find this sentence confusing to be honest. It is true that the main function must be declared to return an integer, as stated by the previous poster. It is, however, not required to actually have a return statement in this function.

What I mean is... this is valid:

Code:

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int main()

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...this is not...

Code:

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void main()

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...nor is this...

Code:

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main()

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...or...

Code:

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char main()

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...etc.