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Tip of the Day
Language: C++
Expertise: Beginner
Aug 30, 2005

Execute Code Before Entering the Main Function

True or false: main is always the first function called in any C++ program? Technically, this is true in C. But in C++, there is one way you can excute code before main is called—and that's by instantiating a global object that has a defined constructor. In this case, the constructor executes before entering main. Here's an example:

#include<iostream>

using namespace std;

class runfirst
{
  public:
    runfirst(void) 
    { 
      cout << "we are in runfirst can you believe it" << endl; 
    } dofirst;

int main()
{
  cout << "woops we arrived to the party late in main" << endl;
  return 0;
}
Ron Stevenhaagen
 
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