performing a search-and-replace operation on a file

I'm having a bit of trouble (surprise surprise). I'm trying to write a program that will prompt the user for the word to search for and the word to use as a replacement. The program should then replace all of the instances of the target word with the replacement word.

heres a sample of the input file:

color.txt

Code:

---

red
yellow
orange
purple
green
yellow
green
purple
white
purple

---

A sample run of the program:

Please input a word to search and a new word to replace
purple
blue

The file will then update to:

color.txt

Code:

---

red
yellow
orange
blue
green
yellow
green
blue
white
blue

---

I tried writting a program that loaded the file into an array and then compare each array value to the words searched...if they matched then it replaced it...if not it went to the next one...

My question is... was that the right logic or was I trying to do something that was impossible. If I'm wrong...what should I do to make it right

(*note* no code is needed....just gentle nudges toward an answer)

I'll post my code if needed/wanted

I saw the FAQ and saw that it is possible to compare strings using the IF statement

this is the code I have

Code:

---

    int w;
    string ifile[inf];
    char old[10],neww[10],temp[10];

    cout<<"Please input a word to search and a new word to replace"<<endl;
    cin>>old;
    cin>>neww;

    for (w=0;w<inf;w++)
    {
        temp=ifile[w];
        if (strcmp(temp,old) == 0)
            {
                  ifile[w]==neww;
            }
           
    }

---

am I doing this wrong? :-/

Using C++ string objects, you can simply say:

Code:

---

if( temp == old )

---

[edit]That is if both temp and old are strings. [/edit]