C++ String Exercises: Check two consecutive, identical letters in a word

Last update on April 11 2025 12:48:15 (UTC/GMT +8 hours)

36. Check for Two Consecutive Identical Letters

Write a C++ program to check whether there are two consecutive (following each other continuously), identical letters in a given string.

Test Data:
("Exercises") -> 0
("Yellow") -> 1

Sample Solution:

C++ Code:

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

using namespace std; // Using the standard namespace

// Function to check if there are two consecutive identical letters in the given word
bool test(string word) {
    for (int i = 0; i < word.size() - 1; i++) { // Loop through the word's characters
        if (word[i] == word[i + 1]) { // Check if current character is equal to the next character
            return true; // Return true if two consecutive identical letters are found
        }
    }
    return false; // Return false if no consecutive identical letters are found
}

int main() {
    // Test cases
    string text = "Exercises";
    cout << "Word: " << text;
    cout << "\nIf there are two consecutive identical letters in the said string?\n";
    cout << test(text) << endl; // Display the result of the test for the word "Exercises"

    text = "Yellow";
    cout << "\nWord: " << text;
    cout << "\nIf there are two consecutive identical letters in the said string?\n";
    cout << test(text) << endl; // Display the result of the test for the word "Yellow"
}

Sample Output:

Word: Exercises
If there are two consecutive identical letters in the said string?
0

Word: Yellow
If there are two consecutive identical letters in the said string?
1

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program to determine if a string contains any two adjacent identical letters and return a boolean.
• Write a C++ program that reads a string and checks for any occurrence of repeated consecutive characters.
• Write a C++ program to scan a string for double letters and output 1 if found, otherwise 0.
• Write a C++ program that iterates over a string and prints true if any two letters in succession are the same.

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Previous C++ Exercise: Reverse the words in a string that have odd lengths.