How to search for a string from a text file - c++

Question

Firstly here is my code I have so far:
#include <iostream>
#include <string>
#include <fstream>
using namespace std;
int arraysize = 35;
int i = 0;
string line;
string searchTerm;
int main()
{
string words[arraysize];
ifstream wordFile;
wordFile.open ("wordFile.txt");
if (wordFile.is_open())
{
while (! wordFile.eof())
{
getline (wordFile, line);
words[i] = line;
i++;
}
wordFile.close();
}
else
{
cout << "Unable to open file" << endl;
}
for (int x = 0; x < arraysize; x++)
{
cout << words[x] << " ";
}
cout << "\n\nEnter in a word you would like to search in the story above:" << endl;
cin >> searchTerm;
for (int y = 0; y < arraysize; y++)
{
if (words[y].compare(searchTerm) !=0)
{
cout << "No match found" << endl;
}
}
}
What I have so far is the program reading from a textfile and then printing those words. What I wanna do next is let the user enter in a word that they would like to search in the textfile, if there is a word like the one they entered print that word if there isn't print out "There isn't a word like that in the textfile"
I just cant get the searching figured out, any suggestions on how to do this?

Answer 1

Here is an example of how you would search for strings within strings
// string::find
#include <iostream> // std::cout
#include <string> // std::string
int main ()
{
std::string str ("There are two needles in this haystack with needles.");
std::string str2 ("needle");
// different member versions of find in the same order as above:
std::size_t found = str.find(str2);
if (found!=std::string::npos)
std::cout << "first 'needle' found at: " << found << '\n';
found=str.find("needles are small",found+1,6);
if (found!=std::string::npos)
std::cout << "second 'needle' found at: " << found << '\n';
found=str.find("haystack");
if (found!=std::string::npos)
std::cout << "'haystack' also found at: " << found << '\n';
found=str.find('.');
if (found!=std::string::npos)
std::cout << "Period found at: " << found << '\n';
// let's replace the first needle:
str.replace(str.find(str2),str2.length(),"preposition");
std::cout << str << '\n';
return 0;
}
This should help you figure out exactly what you need to do
Notice how parameter pos is used to search for a second instance of the same search string. Output:
first 'needle' found at: 14
second 'needle' found at: 44
'haystack' also found at: 30
Period found at: 51
There are two prepositions in this haystack with needles.

Answer 2

How about:
int found = -1;
for (int y = 0; y < arraysize; y++)
{
if (words[y].compare(searchTerm) ==0)
{
found = y;
break;
}
}
if ( found != -1 )
cout << "found!" << endl;
else
cout << "No match found" << endl;
or shorter:
if ( std::find(std::begin(words), std::end(words), searchTerm) == std::end(words) )
cout << "not found";
else
cout << "found";