C++ String Exercises: Remove a specific character from a given string

Last update on December 20 2024 12:32:29 (UTC/GMT +8 hours)

Write a C++ program that removes a specific character from a given string. Return the updated string.

Test Data:
("Filename", "e") -> "Filnam"
("Compilation Time", "i") -> "Complaton Tme"

Sample Solution:

C++ Code:

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

using namespace std; // Using the standard namespace

// Function to remove all occurrences of a specific character from a string
string test(string str, char ch) {
    std::string result_str; // Initialize an empty string to store the modified string
    result_str.reserve(str.size()); // Reserve memory to optimize string appending

    for (size_t i = 0; i < str.size(); ++i) { // Loop through each character in the input string
        if (str[i] != ch) { // Check if the character is not equal to the specified character
            result_str += str[i]; // Append the character to the result string if it's different from 'ch'
        }
    }

    return result_str; // Return the modified string after removing occurrences of 'ch'
}

int main() {
    // Test cases
    string str = "Filename"; // Define a string
    char ch = 'e'; // Define a character
    cout << "String: " << str;
    cout << "\nCharacter: " << ch;
    cout << "\nRemove '" << ch << "' from '" << str << "': " << test(str, ch) << endl; // Display the string after removing 'e' from "Filename"

    str = "Compilation Time"; // Update the string
    ch = 'i'; // Update the character
    cout << "\nString: " << str;
    cout << "\nCharacter: " << ch;
    cout << "\nRemove '" << ch << "' from '" << str << "': " << test(str, ch) << endl; // Display the string after removing 'i' from "Compilation Time"
}

Sample Output:

String: Filename
Character: e
Remove 'e' from 'Filename': Filnam

String: Compilation Time
Character: i
Remove 'i' from 'Compilation Time': Complaton Tme

Flowchart:

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Previous C++ Exercise: Count occurrences of a certain character in a string.