Skip to main content

String practice sample question in C++ for Code Clash Vol. 2

Write a C++ program for find the  Length of the string without using strlen() function.

#include <iostream>
#include <string>
using namespace std;


int main() {
    string str;
    int length = 0;
    cout << "Enter a string: " << endl;
    getline(cin, str);


    for (int i = 0; str[i] != '\0'; i++)

    {
        length++;
    }
    // or we can write but que asking without length() or size()                            

    // length = str.length();


    cout << "Length of string: " << length << endl;
    return 0;
}

 

 

Write a program to check the strength of a password as Weak.

#include <iostream>

using namespace std;

int main() {

    string password;

    cout << "Enter a password: ";

    cin >> password;

    int hasUpper = 0, hasLower = 0, hasDigit = 0, hasSpecial = 0;

    for (int i=0; i<password.size(); i++)

       {

        if (password[i] >= 'A' && password[i] <= 'Z')

            hasUpper = 1;

        else if (password[i] >= 'a' && password[i] <= 'z')

            hasLower = 1;

        else if (password[i] >= '0' && password[i] <= '9')

            hasDigit = 1;

        else hasSpecial = 1;

     }

    if (password.length() >= 8 && hasUpper && hasLower && hasDigit && hasSpecial) {

        cout << "Password is Strong" << endl;

    } else {

        cout << "Password is Weak" << endl;

    }

    return 0;

}

Write a program to check the strength of a password as Weak, Average, or Strong based on specific criteria (e.g., length, special characters, and case sensitivity).

Criteria:

  1. Weak: Password is less than 8 characters or lacks any of the following: uppercase, lowercase, digit, or special character.
  2. Average: Password is at least 8 characters and meets at least two of the criteria (uppercase, lowercase, digit, special character).
  3. Strong: Password is at least 8 characters and meets all four criteria.

#include <iostream>

#include <string>

using namespace std;

 

int main() {

    string password;

    cout << "Enter a password: ";

    cin >> password;

 

    bool hasUpper = false, hasLower = false, hasDigit = false, hasSpecial = false;

 

    for (int i = 0; i < password.size(); i++)

      {

        if (password[i] >= 'A' && password[i] <= 'Z')

            hasUpper = true;      

        else if (password[i] >= 'a' && password[i] <= 'z')

            hasLower = true;       

        else if (password[i] >= '0' && password[i] <= '9')

            hasDigit = true;      

        else

            hasSpecial = true;     

    }

 

    // Check for criteria

    if (password.length() >= 8 && hasUpper && hasLower && hasDigit && hasSpecial)

      {

        cout << "Password is Strong" << endl;

    } else

      {

        cout << "Password is Weak. Suggestions:" << endl;

 

        if (password.length() < 8)

            cout << "- Password must be at least 8 characters long." << endl;

        if (!hasUpper)

            cout << "- Include at least one uppercase letter (A-Z)." << endl;

        if (!hasLower)

            cout << "- Include at least one lowercase letter (a-z)." << endl;

        if (!hasDigit)

            cout << "- Include at least one digit (0-9)." << endl;

        if (!hasSpecial)

            cout << "- Include at least one special character (e.g., !, @, #, $, etc.)." << endl;

    }

 

    return 0;

}

 

Write a program to sort any string in increasing or decreasing order based on user input.

#include <iostream>

using namespace std;

void bubbleSort(string &str, bool ascending) {

    int n = str.size();

    for (int i = 0; i < n - 1; i++) {

        for (int j = 0; j < n - i - 1; j++) {

            if ((ascending && str[j] > str[j + 1]) || (!ascending && str[j] < str[j + 1])) {

                char temp = str[j];

                str[j] = str[j + 1];

                str[j + 1] = temp;

            }

        }

    }

}

 

int main() {

    string str;

    char choice;

    cout << "Enter a string: ";

    cin >> str;

    cout << "Choose sorting order (I for Increasing, D for Decreasing): ";

    cin >> choice;

 

    if (choice == 'I' || choice == 'i') {

        bubbleSort(str, true);

        cout << "String in increasing order: " << str << endl;

    }

    else if (choice == 'D' || choice == 'd') {

        bubbleSort(str, false);

        cout << "String in decreasing order: " << str << endl;

    }

    else {

        cout << "Invalid choice. Please enter I or D." << endl;

    }

    return 0;

}

 

Write a program to count spaces, words, and sentences from a string fetched from a file.

#include <iostream>

using namespace std;

int main() {

    string text;

    cout << "Enter a string: ";

    getline(cin, text);

    int spaces = 0, words = 0, sentences = 0;

    for (int i = 0; i < text.size(); i++)

      {

        if (text[i] == ' ')

            spaces++;

        else if (text[i] == '.' || text[i] == '!' || text[i] == '?')

            sentences++;

    }

 

    words = spaces + 1;

    cout << "Spaces: " << spaces << endl;

    cout << "Words: " << words << endl;

    cout << "Sentences: " << sentences << endl;

    return 0;

}

 

Write a program to reverse a given string.

#include <iostream>

using namespace std;

int main() {

    string str, reversed;

    cout << "Enter a string: ";

    cin >> str;

    int n = str.size();

    for (int i = n - 1; i >= 0; i--) {

        reversed += str[i];

    }

    cout << "Reversed string: " << reversed << endl;

    return 0;

}

Write a program to check whether a given number or string is a palindrome.

#include <iostream>

using namespace std;

bool isPalindromeString(string str) {

    int start = 0, end = str.size() - 1;

    while (start < end) {

        if (str[start] != str[end]) {

            return false;

        }

        start++;

        end--;

    }

    return true;

}

 

bool isPalindromeNumber(int num) {

    int original = num, reversed = 0;

    while (num > 0) {

        int digit = num % 10;

        reversed = reversed * 10 + digit;

        num /= 10;

    }

    return original == reversed;

}

 

int main() {

    cout << "Enter '1' to check a number or '2' to check a string: ";

    int choice;

    cin >> choice;

 

    if (choice == 1) {

        int num;

        cout << "Enter a number: ";

        cin >> num;

        if (isPalindromeNumber(num)) {

            cout << num << " is a palindrome number." << endl;

        } else {

            cout << num << " is not a palindrome number." << endl;

        }

    } else if (choice == 2) {

        string str;

        cout << "Enter a string: ";

        cin >> str;

 

        if (isPalindromeString(str)) {

            cout << str << " is a palindrome string." << endl;

        } else {

            cout << str << " is not a palindrome string." << endl;

        }

    } else {

        cout << "Invalid choice!" << endl;

    }

 

    return 0;

}


Reverse a String: Input a string and reverse its characters.

#include <iostream>

using namespace std;

 

int main() {

    string str;

    getline(cin,str);

    int n = str.length();

    for (int i = 0; i < n / 2; i++) {

        char temp = str[i];

        str[i] = str[n - i - 1];

        str[n - i - 1] = temp;

    }

    cout << str;

    return 0;

}

 

Check for Palindrome: Determine if a string is a palindrome.

 

#include <iostream>

using namespace std;

 

int main() {

    string str;

    cin >> str;

    int n = str.length();

    bool isPalindrome = true;

 

    for (int i = 0; i < n / 2; i++) {

        if (str[i] != str[n - i - 1]) {

            isPalindrome = false;

            break;

        }

    }

 

    if (isPalindrome)

        cout << "Palindrome";

    else

        cout << "Not a Palindrome";

 

    return 0;

}

 

 Count Vowels and Consonants: Count the number of vowels and consonants in a string.

#include <iostream>

using namespace std;

 

int main() {

    string str;

    getline(cin,str);

 

    int vowels = 0, consonants = 0;

 

    for (char c : str) {

        char ch = tolower(c);

        if ((ch >= 'a' && ch <= 'z')) {

            if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u')

                vowels++;

            else

                consonants++;

        }

    }

 

    cout << "Vowels: " << vowels << endl;

    cout << "Consonants: " << consonants << endl;

 

    return 0;

}

 Find String Length: Implement your own function to calculate the length of a string without using strlen().

 

#include <iostream>

using namespace std;

 

int stringLength(string str) {

    int length = 0;

    for (char c : str)

     {

        length++;

    }

    return length;

}

 

int main() {

    string str;

    getline(cin,str);

 

    cout << "Length of the string: " << stringLength(str) << endl;

    return 0;

} 

 

 


Labels:

Comments

Post a Comment

Popular posts from this blog

C++ Lec-2 Introduction to Object-Oriented Programming (OOP) in C++

  Introduction to Object-Oriented Programming (OOP) in C++ Object-Oriented Programming (OOP) is a programming paradigm that uses objects and classes to organize software design. It allows for modelling real-world entities and relationships in a program. C++ is an object-oriented programming language that provides features to implement OOP concepts effectively. Key Concepts of OOP   Class and Object o    Class : A blueprint for creating objects. It defines properties and behaviours of objects.   class Car { public:     string brand;     string model;     int year; };   o    Object : An instance of a class.   Car car1; car1.brand = "Mahindra"; car1.model = "THAR"; car1.year = 2024;   Encapsulation o    Encapsulation is the bundling of data and methods that operate on that data within a single unit, or class. It restricts direct acces...
Post a Comment
Read more

C++ Lec-1 (Introduction to Programming Languages)

  Introduction to Programming Languages ________________________________________________________________________ P rogramming languages are formal languages comprising a set of instructions that produce various kinds of output. They are used in computer programming to implement algorithms and control the behavior of machines. Language Generation Programming languages have evolved through several generations: First Generation (1GL) : Machine language, the most basic level of programming languages, consisting of binary code. Second Generation (2GL) : Assembly language, a low-level language with a strong correspondence to the machine language instructions. Third Generation (3GL) : High-level languages like C, C++, Java, Python, which are more abstract and easier for humans to understand. Fourth Generation (4GL) : Languages closer to human language, often used for database querying and report generation (e.g., ...
Post a Comment
Read more

Flow Charts - What Is a Flow Chart? When to Use a Flowchart? Flowchart Symbols & Components

  Flow Charts     Flow charts are a useful tool in many situations, as we make a process easy to understand at a glance. Using just a few words and some simple symbols, they show clearly what happens at each stage and how this affects other decisions and actions.   What Is a Flow Chart?     In 1921, the Frank and Lillian presented what was only a "graphic-based method" in a presentation titled: “ Process Charts: First Steps in Finding the One Best Way to do Work ”, to members of the American Society of Mechanical Engineers (ASME). When to Use a Flowchart?     Flowchart is a very simple yet powerful tool to improve productivity in both our personal and work life. Here are some ways flowchart can be helpful:   ·      Document a process ·      Present solution to a problem ·      Brainstorm ideas in a meeting ·      Design an operation system ·    ...
Post a Comment
Read more