n00b need help

I am new to programming in C++.
I have came across a problem and i was wondering if someone could help me out.
I have this code <posted at the bottom> and when i compile it it says:
'=' : cannot convert from 'bool' to 'const char *

heres the code:

Code:

#include <iostream>
using namespace std;

int main(){
	int num = 2;
	const char * a ;
	a = "COLOR" && num ;
	system(a);
	system("PAUSE");
	return 0;
}