Question

Write a program that replaces words in a sentence. The input begins with word replacement pairs (original and replacement). The next line of input is the sentence where any word on the original list is replaced.

Answer 1

Answer:

sentence=input("Enter a sentence:")

lis= sentence.split();

print(lis)

word=input("Enter the word to replace:")

word1=input("Enter the word to be replaced:")

i=0

for i in range(0, len(lis)):

   if lis[i]==word:

       lis[i]=word1

       i+=1

   else:

       i+=1

       continue

print("Sentence after replacement is")

print(*lis)

Explanation:

The code is as above. We here are splitting the sentence and storing in a list. And then we are replacing the word, and finally printing the sentence with replaced word.

Answer 2

Answer:

This program is written in C++ language using Dev C++. The explanation of code is given below:

Explanation:

#include<iostream>

#include <bits/stdc++.h>

using namespace std;

 

int main()

{

   string str;// user enter sentence

   string find;//find word in sentence

   string replace;//replace word in sentence

   cout<<"Enter Sentence\n";

   getline(cin, str);//user enter sentence

   cout<<"\n Now enter key to find in sentence\n";

   getline(cin,find);//user enter "word" to find in sentence

   int findSize=(int)find.size();

   cout<<"\nNow enter a replacing word\n";

   getline(cin,replace);//user enter "word" to replace in sentence

cout << "\nOriginal text: " << str;//show original sentence

       for (int j = 0; j < (int)str.size(); j++) {//loop  

           string key = str.substr(j, findSize), repl; //search in sentence

           if (key == find) {//if find

               repl = replace;//replace

               for (int k = 0; k < findSize+2; k++) {//append

                   str[j+k] = repl[k];// new sentence

               }

           }

       }

      cout <<"\nNew text: " << str << endl;

   

   return 0;

}