Write a program that receives two strings (C++ string) from the user, and create

Question

Write a program that receives two strings (C++ string) from the user, and creates a third C style string (null-terminated character array) which is concatenation of two strings entered by the user.

DO NOT USE + operator to concatenate the two C++ strings. STEPS TO GUIDE YOU:

- Your first task will be to convert both the C++ strings to their corresponding C-style strings (HINT: c_str() and new will be used for this).

- After allocating dynamic memory to hold the two converted C-style strings, one needs to string copy the c_str() converted strings to their respective newly allocated space using strcpy() [Don’t forget required header file for this that needs to be included].

- These newly allocated space are pointers to the respective array of characters (or C-style string).

- Then, you must again use dynamic memory allocation technique using “new” operator to create the third C-style string (or character array) that will hold the concatenation of the above two strings. Decide what should be the size of this third C-style string that needs to be used in new.

- Using For-loop on the first two C-style strings, you will assign values to the third C-style string and display the contents of this final array. Illustration: C++ str1: “computer” C-style: (generated using new, c_str() and strcpy() ) c o m p u t e r C++ str2: “science” C-style: (generated using new, c_str() and strcpy() ) s c i e n c e Concatenated C-style string: c o m p u t e r s c i e n c e Print the two strings entered by the user, and the third string generated.

Eg : Strings entered by the user computer science Output : computer science computer science

Explanation / Answer

#include<iostream>
#include<conio>
#include<string>
using namespace:std
void main()
{
   string s1="computer science", s2="computer science";
   char s3[20];
   int i,c=0;
   char* cstr=new char[s1.length()+1];
   strcpy(cstr,s1.c_str());

   char* cstr1=new char[s2.length()+1];
   strcpy(cstr1,s2.c_str());

   for(i=0;i<strlen(cstr);i++)
   {
       s3[c]=cstr[i];
       c++;
   }
      
   for(i=0;i<strlen(cstr1);i++)
   {
       s3[c]=cstr1[i];
       c++;
   }
   cout<<s1<<endl<<s2<<endl<<"concatenated C-style string:"<<s3;
   getch();
}

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