C++ String Exercises: Identify the missing letter in a string

Last update on December 20 2024 12:32:25 (UTC/GMT +8 hours)

Write a C++ program to identify the missing letter in a given string (list of alphabets). The method returns, "There is no missing letter!" if no letters are missing from the string.

Sample Data:
("abcef") -> "d"
("abcdef") -> "There is no missing letter!"

Sample Solution:

C++ Code:

#include <bits/stdc++.h> // Include all standard libraries

using namespace std; // Using the standard namespace

// Function to identify a missing letter in a string sequence
string test(string text) {
  int length = text.size(); // Get the length of the input string
  for (int i = 1; i < length; i++) { // Iterate through the string
    if (++text[i - 1] != text[i]) { // Check if the adjacent characters are consecutive
      return text.substr(i - 1, 1); // If a missing letter is found, return the missing letter
    }
  }
  return "\nThere is no missing letter!"; // If no missing letter is found, return a message indicating so
}

int main() {
  //string text ="abcef";
  string text = "abcdef";
  cout << "Original string: " << text; // Display the original string
  cout << "\n\nIdentify the missing letter in the said string: ";
  cout << test(text) << endl; // Call the function to identify the missing letter and display the result
}

Sample Output:

Original string: abcdef

Identify the missing letter in the said string: 
There is no missing letter!

Flowchart:

C++ Code Editor:

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Previous C++ Exercise: Print an integer with commas as thousands separators.