hate to love

[chasescoot066]

Having an issue with a project. I have to convert four letter words to love. THe issue is my program will let you enter in a sentence, however it has no output. I think it may have something to do with my while look because I am lost as to what is suppose to go there. At first I had it set to look for whitespace using 'isspace', but received an error. So I tried setting it so the the string for a the fourWord is not whitespace and I end up with no output. HEre is the code:

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

int main ( )
{
	string sentence; //user's input
	string fourWord; //find 4 letter word
	string loveSentence; //users sentence after adding the word love
	//string temp;

	cout << "This program will convert four letter words to 'love'." << endl;
	cout << endl;
	cout << "Enter A Sentence: ";
	getline (cin, sentence);

	while (fourWord != " ")
	{
		if (fourWord.length( ) == 4)
		{
			if (isupper (fourWord[0]))
			{
				loveSentence += "Love ";
			}
			else
			{
				loveSentence += "love ";
			}
		}
		else
		{
			loveSentence += fourWord + " ";
		}
	}

	cout << loveSentence << endl;

	return 0;
}

[kbw]

I would imagine it gets stuck in an infinite loop, repeatedly running lines 18 and 33.

Have you tried tracing it to see what the values of loveSentece are?

[anilpanicker]

If undestood it correctly you need to go through each word in the sentence and if that word is 4 characters long replace it with the word "Love", then you need to do something like this

getline(cin,sentence);
	//we need to extract each word from the sentence and 
	// check for its size, if it is a four letter word
	// then replace it with "Love"
	// ex: "I hate you cpp haha haha 1234
	//1. if some empty spces in the begining ignore it and
	// find the begining of sentence
	string::size_type pos1= sentence.find_first_not_of(" ",0);
	//2. find the first space from there
	string::size_type pos2=sentence.find_first_of(" ",pos1);
	// between these two pos you will get a word
	// 3. check for the size and replce it
	while(pos1 != string::npos || pos2 != string::npos)
	{
		fourWord= sentence.substr(pos1,pos2-pos1);
		cout << fourWord <<endl;
		string::size_type s=fourWord.size();
		if(s==4)
			sentence.replace(pos1,pos2-pos1,"Love");
		pos1= sentence.find_first_not_of(" ",pos2); // next word begin
		pos2=sentence.find_first_of(" ",pos1); // next word end
	}
	cout << sentence << endl;

[mcleano]

You get input from the user and store it in sentence, but you never use or check sentence again?

[Warrior2089]

Of course there is no output. The user types in his/her/it? sentence and it automatically checks the string fourWord without adding anything into fourWord. I don't know exactly how it would be done, but you would need to check the string sentence for four letter words to begin with before even moving on past line 18.