rand() gives same number every time?

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string randomizer(string option1, string option2, string option3, string option4)

{
	string choice;

	switch(rand()%5)
	{
		case 1:
		{
			choice=option1;
            break;
		}
		case 2:
		{
			choice=option2;
            break;
		}
		case 3:
		{
			choice=option3;
            break;
		}
		case 4:
		{
			choice=option4;
            break;
		}
        default:
        {
            choice="null:Error";
        }
	}
	
	
	return choice;
	
}


it always returns option2. Why does it do this? Help please!
Are you seeding it with srand() at the start of your program?
no, how do i do that?
Call srand() once at the beginning of your program, typically with the parameter time(0).
http://cplusplus.com/reference/clibrary/cstdlib/srand/
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