Problems with generating random numbers

[NetHacker]

I've been writing a very simple chatbot but I'm stuck on generating random responses. I'm attempting to generate a random number between 1 and 5, and each number corresponds to a response in a switch statement. Here's my code:

#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;

int main()
{
    srand() = time(NULL);
    string name = "hat is your name";
    string userName = "USER";
    size_t found;
    while(true)
    {
        string input;
        string inputPrev = input;
        input = "";
        cout << userName << ": ";
        getline(cin,input);
        cout << "MARTY: ";
        found = input.find(name);
        if(found != string::npos)
        {
            int random = rand();
            while(random < 1 || random > 5)
            {
            	random = rand();
            }
            switch(random)
            {
                case 1:
                    cout << "My name is Marty.\n";
                case 2:
                    cout << "My name's Marty.\n";
                case 3:
                    cout << "The name's Marty.\n";
                case 4:
                    cout << "You can call me Marty.\n";
                case 5:
                    cout << "Call me Marty.\n";
            }
        }
        else
        {
            cout << "I don't understand.\n";
        }

    }
    return 0;
}

However, when compiling in g++ on Ubuntu, I get this error message:

marty.cpp:8:11: error: too few arguments to function ‘void srand(unsigned int)’

Please keep in mind that I don't know exactly what I'm doing. I'm basing the random number generating code off of various tutorials. So what's wrong? Thanks in advance for your assistance!

[shacktar]

That error's saying that the srand function expects an unsigned int as a parameter, but you're not supplying any.

This:

srand() = time(NULL);

should be this:

srand( time(NULL) );

[NetHacker]

I remember thinking of doing that, and I have no idea why I didn't! Anyway, thanks a ton. My project is back underway!

[Gaminic]

By the way, you can provide bounds for your random function:
int random = rand()%5+1; // random is now between 1 and 5, inclusive.

[Disch]

You'll also need to break; each of your cases in your switch statement or flow will "spill over" (ie: option 1 will print all 5 strings)