How Can I Check Overflows? - I used cin.getline() - C++

Both examples doesn't work. User is expected to insert chars less than MAX_DATA length, but i want to handle the situation when user inserts over MAX_DATA. I tried several examples, non of them worked...

char userInput[MAX_DATA];
               cin.getline(userInput, MAX_DATA);
		if(cin.failbit)
		{
			cout<<"Overflow occured. Restart Application"<<endl;
			system("pause");
			exit(-1);
		}
 
//***************************************************************//
 
               cin.getline(userInput, MAX_DATA);
		if(strlen(userInput) > MAX_DATA)
		{
			cout<<"Overflow occured. Restart Application"<<endl;
			system("pause");
			exit(-1);
		}

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