Thread: Help with strings

I am learning about strings and I am trying to interpret what the +1 is for when the const MAX_LEN is used. I know strings have a null terminating value, does this allow room for it?

Code:

void readLine(istream &, char *, int); //used for TASK 3 only

#define TASK 1

#if TASK==1
const int MAX_LEN = 7;   //longest string allowed.
#else
const int MAX_LEN = 25;
#endif

int main(){
	char aString[MAX_LEN+1];   // what is +1 used for?

	cout << "Enter a string (maximum of " << MAX_LEN << " characters)\n";
	for (int i=1; i<=MAX_LEN; i++) cout << i%10;  cout << endl;