﻿ C# - Check if a repeated a follows the first a in a string

# C#: Check whether the first appearance of 'a' in a given string is immediately followed by another 'a'

## C# Sharp Basic Algorithm: Exercise-28 with Solution

Write a C# Sharp program to check whether the first appearance of "a" in a given string is immediately followed by another "a".

Visual Presentation:

Sample Solution:-

C# Sharp Code:

``````using System;

// Namespace declaration
namespace exercises
{
// Class declaration
class Program
{
// Main method - entry point of the program
static void Main(string[] args)
{
// Displaying the output of the 'test' method with different string inputs
Console.WriteLine(test("caabb"));    // Output: False
Console.WriteLine(test("babaaba"));  // Output: True
Console.WriteLine(test("aaaaa"));    // Output: False
Console.ReadLine();  // Keeping the console window open
}

// Method to check for the presence of "aa" in the string within the first two occurrences of 'a'
public static bool test(string str)
{
var counter = 0;  // Counter to track occurrences of 'a' in the string

// Loop through the characters of the string except for the last character
for (var i = 0; i < str.Length - 1; i++)
{
if (str[i].Equals('a'))  // Check if the character at index 'i' is 'a'
{
counter++;  // Increment the counter for each occurrence of 'a'
}

// Check if the current and next characters form the substring "aa" and the 'a' occurrences are less than 2
if (str.Substring(i, 2).Equals("aa") && counter < 2)
{
return true;  // Returns true if "aa" is found within the first two 'a's
}
}

return false;  // Returns false if "aa" is not found within the first two 'a's
}
}
}
```
```

Sample Output:

```True
False
True```

Flowchart:

C# Sharp Code Editor:

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