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Length of a String

Certification: Basic Level Accuracy: 60.26% Submissions: 78 Points: 5

Write a C++ program that finds the length of a string using pointers.

Example 1
     
  • Input: string = "hello"
    •  
  • Output: 5
    •  
  • Explanation: 
       
    • Step 1: Initialize a pointer to the start of the string.
      •  
    • Step 2: Initialize a counter to 0.
      •  
    • Step 3: Increment the counter and move the pointer to the next character.
      •  
    • Step 4: Repeat step 3 until the null character is encountered.
      •  
    • Step 5: Return the counter value as the length of the string.
      •  
    •
Example 2
     
  • Input: string = "world"
    •  
  • Output: 5
    •  
  • Explanation: 
       
    • Step 1: Initialize a pointer to the start of the string.
      •  
    • Step 2: Initialize a counter to 0.
      •  
    • Step 3: Increment the counter and move the pointer to the next character.
      •  
    • Step 4: Repeat step 3 until the null character is encountered.
      •  
    • Step 5: Return the counter value as the length of the string.
      •  
    •
Constraints
     
  • 1 ≤ string length ≤ 10^6
    •  
  • Use pointers to find the length
    •  
  • Time Complexity: O(n) where n is the length of the string
    •  
  • Space Complexity: O(1)
    •
StringsPointers and ReferencesTech MahindraShopify
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Hint
Solution

Solution Hints

    
  
  • Use a pointer to traverse the string until the null character ('\0') is encountered.
    • 
  
  • Count the number of characters traversed.
    •

Steps to solve by this approach:

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

 Step 2: Initialize a counter variable to zero.

 Step 3: While the current character is not the null terminator, increment the counter.

 Step 4: After each increment, move the pointer to the next character.

 Step 5: Return the final counter value, which represents the string length.

 Step 6: In main, declare a constant character pointer with a string value.

 Step 7: Call string_length with this pointer and print the result.

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