Simple2Code

C++ Program to Find the Length of a String using Pointers

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This is the C++ tutorial where we will Write a C++ program to find length of string using pointer. If you want to learn more about Pointers and Strings in C++, click the link below.

Explanation: The program takes the string value from the user as an input. we also declare a character pointer in a program. The address of the first character of a string is initialized to this pointer and then the length is calculated using while.

You can also perform the same operation using for loop.

  • &: It is the address of operator.
  • *: It is the value at operator.

C++ Program to Find the Length of a String using Pointers

#include <iostream>
using namespace std;

int main()
{
  char str[100], *ptr;
  int length = 0;

  cout << "Enter the String: ";
  cin >> str;

  //initializing the pointer
  ptr = &str[0];

  while(*ptr)
  {
     length++;
     ptr++;
  }

  cout << "\nLength of a string: " << length;

  return 0;
}

Output:

Enter the String: simple2code

Length of a string: 11

However, if you want to enter the string with spaces, use gets(str) instead of cin >>str.

Also, you may go through the following program on string:

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