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Count the Number of Occurrences of a Character in a String in C++

In this exercise, you will write a C++ program that counts how many times a specific character appears in a given string. The program will take both a string and a character as input from the user. It will then loop through the string and use a counter to track the number of occurrences of the specified character.

This exercise is useful for understanding how to work with strings and loops in C++. It also demonstrates how to use the `char` and `string` data types together.

Group

Flow Control in C++

Objective

1. Prompt the user to input a string.
2. Ask the user for a character to search for.
3. Use a loop to iterate through the string and count how many times the character appears.
4. Display the result to the user.

Write a program that counts how many times a character appears in a string.

Example C++ Exercise

 Copy C++ Code 
#include <iostream> // Include the iostream library for input and output
#include <string> // Include the string library to work with string data types

using namespace std; // Use the standard namespace

// Main function - entry point of the program
int main() {
    string str; // Variable to store the input string
    char ch; // Variable to store the character to search for
    int count = 0; // Variable to count the occurrences of the character

    // Prompt the user to enter a string
    cout << "Enter a string: ";
    getline(cin, str); // Read the entire line of input into the string

    // Ask the user to input the character to search for
    cout << "Enter a character to search for: ";
    cin >> ch; // Read the character input

    // Loop through the string to count occurrences of the character
    for (int i = 0; i < str.length(); i++) { // Iterate through each character in the string
        if (str[i] == ch) { // If the current character matches the one being searched
            count++; // Increment the count
        }
    }

    // Output the result to the user
    cout << "The character '" << ch << "' appears " << count << " times in the string." << endl;

    return 0; // Return 0 to indicate successful execution of the program
}

 Output

Enter a string: Hello World
Enter a character to search for: o
The character 'o' appears 2 times in the string.

//Or for another string:
Enter a string: OpenAI is great
Enter a character to search for: i
The character 'i' appears 2 times in the string.

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