C++ String Exercises: Count occurrences of a certain character in a string

Last update on December 20 2024 12:26:07 (UTC/GMT +8 hours)

Write a C++ program that counts the number of instances of a certain character in a given string.

Test Data:
("Exercises", "e") -> 2
("Compilation Time", "i") -> 3

Sample Solution:

C++ Code:

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

using namespace std; // Using the standard namespace

// Function to count occurrences of a specific character in a given string
int test(string s, char c) {
    int res = 0; // Initialize a variable to count occurrences of the character
    for (int i = 0; i < s.length(); i++) { // Loop through each character of the string
        if (s[i] == c) { // Check if the current character matches the specified character
            res++; // Increment the count of occurrences if a match is found
        }
    }
    return res; // Return the total count of occurrences
}

int main() {
    // Test cases
    string str = "Exercises"; // Define a string
    char ch = 'e'; // Define a character
    cout << "String: " << str;
    cout << "\nCharacter: " << ch;
    cout << "\nCount occurrences of '" << ch << "' in '" << str << "': " << test(str, ch) << endl; // Display the count of 'e' in "Exercises"

    str = "Compilation Time"; // Update the string
    ch = 'i'; // Update the character
    cout << "\nString: " << str;
    cout << "\nCharacter: " << ch;
    cout << "\nCount occurrences of '" << ch << "' in '" << str << "': " << test(str, ch) << endl; // Display the count of 'i' in "Compilation Time"
}

Sample Output:

String: Exercises
Character: e
Count occurrences of 'e' in 'Exercises': 2

String: Compilation Time
Character: i
Count occurrences of 'i' in 'Compilation Time': 3

Flowchart:

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Previous C++ Exercise: Check two consecutive, identical letters in a word.