How To Find Length Of String In C++ Using For Loop

Finding the length of a string is a common task in programming, and it can be done easily using C++. In this tutorial, we will be using a for loop to find the length of a string in C++.

Step 1: Declare the string

The first step is to declare the string. In C++, you can declare a string using the string data type. Here is an example:

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string myString = "Hello world";

Step 2: Initialize Counter

Next, we need to initialize a counter variable that we will use to count the number of characters in the string. Here is an example:

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int counter = 0;

Step 3: Use For Loop to Iterate Over the String

Now, we will use a for loop to iterate over the string and count the number of characters. Here is an example:

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for(int i = 0; myString[i] != '\0'; i++) {
   counter++;
}

In this for loop, we are starting at index 0 and continuing until we reach the end of the string, which is denoted by the null character ‘\0’. For each character in the string, we are incrementing the counter variable.

Step 4: Output the Result

Finally, we can output the length of the string using the counter variable. Here is an example:

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cout << "The length of the string is: " << counter << endl;

This will output the length of the string to the console.

And that’s it! You now know how to find the length of a string in C++ using a for loop.

Here’s the full code:

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#include <iostream>
#include <string>
 
using namespace std;
 
int main() {
   string myString = "Hello world";
   int counter = 0;
  
   for(int i = 0; myString[i] != '\0'; i++) {
      counter++;
   }
  
   cout << "The length of the string is: " << counter << endl;
  
   return 0;
}

And here’s the output:

The length of the string is: 11