Thread: Trouble with vectors

I am writing a program to read in a line of text and then replace all four letter words with the word 'love'. I am getting the following compiler error:

love.cpp: In function ‘void replace(std::vector<char, std::allocator<char> >&)’:love.cpp:60: error: ISO C++ forbids comparison between pointer and integer

line 60 is the while statement in the replace function.

I am hoping someone could point me in the right direction. Thank you in advance.

Code:

#include <iostream>
#include <vector>

using namespace std;

void introduction();
//Explains what the program does

void get_input(vector<char>& v);
//Asks user to input text

void replace(vector<char>& v);
//Replaces all four letter words with the word love.

void output(vector<char> v);
//Outputs new sentence.

int main()
{
	vector<char> v_input;
	introduction();
	get_input(v_input);
	replace(v_input);
	output(v_input);
	return 0;
}

//uses iostream
void introduction()
{
	cout << "This program will ask the user to input a sentence and\n"
	     << "then will output the sentence with all four letter words\n"
	     << "replaced with the word 'love'\n"
	     << endl;
}

//uses iostream
//uses vector
void get_input(vector<char>& v)
{
	char tmp;
	cout << "Please type in a sentence:\n";
	cin.get(tmp);
	do
	{
		if (!cin.get(tmp))  //breaks if character is not able to be read in
			break;
		v.push_back(tmp);
	}while (tmp != '\n');
	
}		

//uses iostream
//uses vector
void replace(vector<char>& v)
{
	int j, count;
	for (int i = 0; i < v.size(); i++)
	{
		j = i + 1;

		// now checking to see if the next word is = 4 letters
		while (v[j] != '\n' || v[j] != ' ' || v[j] != '.' || v[j] != ',' || v[j] != "")
		{
			count++;
			j++;
		}
		if (count == 4)  //replaces 4 letter word with 'love'
		{
			v.push_back('l');
			v.push_back('o');
			v.push_back('v');
			v.push_back('e');
		}
		i = i + j;
	}
}

//uses iostream
//uses vector
void output(vector<char> v)
{
	cout << endl
	     << "The new sentence with the words replaced is:\n";
	for (int i = 0; i < v.size(); i++)
	{
		cout << v[i];
	}
	cout << endl;
}