Q4.cpp

#include <iostream>

using namespace std;

const int Msize = 500;

void findAndReplace(char inputText[], const char targetWord[], const char replacementWord[]) {
    int position = 0;
    int targetLength = 0;
    int replacementLength = 0;

    while (inputText[position] != '\0') {
        position++;
    }

    while (targetWord[targetLength] != '\0') {
        targetLen++;
    }

    while (replacementWord[replacementLength] != '\0') {
        replacementLength++;
    }

    for (int i = 0; i < position; ++i) {
        bool found = true;
        for (int j = 0; j < targetLength; ++j) {
            if (inputText[i + j] != targetWord[j]) {
                found = false;
                break;
            }
        }

        if (found) {
            for (int j = 0; j < replacementLength; ++j) {
                inputText[i + j] = replacementWord[j];
            }
            i += replacementLength - 1;
        }
    }
}

int main() {
    char text[Msize + 1];
    char findWord[Msize];
    char replaceWord[Msize];

    // Input text
    cout << "Please enter the text (500 chars max):" << endl;
    cin.getline(text, Msize + 1);

    while (true) {
        // Input word to find
        cout << "Please enter the word to find (or enter an empty word to exit):" << endl;
        cin.getline(findWord, Msize);

        // Check for exit condition
        if (findWord[0] == '\0') {
            break;
        }

        // Input word to replace
        cout << "Please enter the replace word:" << endl;
        cin.getline(replaceWord, Msize);

        // Find and replace
        findAndReplace(text, findWord, replaceWord);

        // Display result
        cout << "Result:" << endl;
        cout << text << endl;
    }

    return 0;
}