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Copy One String to Another

Certification: Basic Level Accuracy: 53.85% Submissions: 13 Points: 10

Write a C++ program that copies one string to another using pointers. The program should take a string as input and return a new string that is a copy of the input string.

Example 1
     
  • Input: string = "Programming"
    •  
  • Output: "Programming"
    •  
  • Explanation: 
       
    • Step 1: Determine the length of the input string.
      •  
    • Step 2: Allocate memory for the new string (length + 1 for null terminator).
      •  
    • Step 3: Initialize pointers to the first characters of both strings.
      •  
    • Step 4: Copy each character from source to destination using pointers.
      •  
    • Step 5: Add null terminator at the end of the new string.
      •  
    •
Example 2
     
  • Input: string = "C++"
    •  
  • Output: "C++"
    •  
  • Explanation: 
       
    • Step 1: Determine the length of the input string.
      •  
    • Step 2: Allocate memory for the new string (length + 1 for null terminator).
      •  
    • Step 3: Initialize pointers to the first characters of both strings.
      •  
    • Step 4: Copy each character from source to destination using pointers.
      •  
    • Step 5: Add null terminator at the end of the new string.
      •  
    •
Constraints
     
  • 1 ≤ len(string) ≤ 10^3
    •  
  • String contains printable ASCII characters
    •  
  • Time Complexity: O(n) where n is the length of the string
    •  
  • Space Complexity: O(n) for storing the result
    •
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Hint
Solution

Solution Hints

    
  
  • Use pointers to traverse the source string.
    • 
  
  • Allocate memory for the destination string dynamically.
    • 
  
  • Copy characters from the source string to the destination string using pointers.
    •

Steps to solve by this approach:

 Step 1: Define a function copyString that takes a constant character pointer as parameter.

 Step 2: Calculate the length of the input string.

 Step 3: Dynamically allocate memory for the destination, big enough to hold the source string plus null terminator.

 Step 4: Create a pointer to track our position in the destination string.

 Step 5: Copy characters from source to destination one by one, advancing both pointers.

 Step 6: Add the null terminator at the end of the destination.

 Step 7: Return the pointer to the destination string.

 Step 8: In main, call copyString with a source string, print the result, and free the allocated memory.

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