{"id":8400,"date":"2022-04-14T11:55:58","date_gmt":"2022-04-14T11:55:58","guid":{"rendered":"https:\/\/www.prepbytes.com\/blog\/?p=8400"},"modified":"2023-07-19T07:09:57","modified_gmt":"2023-07-19T07:09:57","slug":"20-must-practice-basic-c-programs-for-beginners","status":"publish","type":"post","link":"https:\/\/prepbytes.com\/blog\/20-must-practice-basic-c-programs-for-beginners\/","title":{"rendered":"20 Must Practice Basic C++ Programs for Beginners"},"content":{"rendered":"

\"\"<\/p>\n

In this article, we\u2019ve covered the top 20 must practice basic C++ practice problems for beginners. It is advised to solve these questions from your side, i.e., this article should be a learning resource for starting your coding journey.<\/p>\n

    \n
  1. \n

    The beginning of any programming language deals with your first \u201cHello World!\u201d Can you print this \u201cHello World!\u201d in C++?<\/strong>
    \nAns.<\/strong> (Main function is always executed first)<\/p>\n

    #include\nusing namespace std;\nint main() {\n    cout<<"Hello World!";\n    return 0;\n}<\/code><\/pre>\n
    Output:<\/strong><\/p>\n
    Hello World<\/code><\/pre>\n<\/li>\n
  2. \n
    Can you add two variables in C++?<\/strong>
    \nAns.<\/strong> (Declare two variables and use \u2018+\u2019 operator)<\/p>\n
    #include \nusing namespace std;\nint main() {\n    int a = 2;\n    int b = 6;\n    cout<<a+b;\n    return 0;\n}<\/code><\/pre>\n
    Output:<\/strong><\/p>\n
    8<\/code><\/pre>\n<\/li>\n
  3. \n
    Find the maximum number in an array of integers.<\/strong>
    \nAns.<\/strong> (Define a maximum variable which will store the maximum in each iteration)<\/p>\n
    #include \nusing namespace std;\nint main() {\n    int arr[5] = { 1, 2, 5, 4, 3 };\n    int max = 0;\n    for(int i = 0;i<5;i++)\n        {\n            if(max < arr[i])\n                max = arr[i];\n        }\n    cout<<max<<endl;\n    return 0;\n}<\/code><\/pre>\n
    Output:<\/strong><\/p>\n
    5<\/code><\/pre>\n<\/li>\n
  4. \n
    Can you find out the sum of the digits of a number?<\/strong>
    \nAns.<\/strong> (run a loop until the number is zero and keep adding each digit)<\/p>\n
    #include \nusing namespace std;\nint main() {\n    int number = 145;\n    int sum = 0;\n    while(number!=0){\n        int digit = number%10;\n        number = number\/10;\n        sum += digit;\n    }\n    cout<<sum<<endl;\n    return 0;\n}<\/code><\/pre>\n
    Output:<\/strong><\/p>\n
    10<\/code><\/pre>\n<\/li>\n
  5. \n
    Try to swap two numbers with a third variable.<\/strong>
    \nAns.<\/strong> (store one number is a temporary variable)<\/p>\n
    #include \nusing namespace std;\nint main() {\n    int number1 = 145;\n    int number2 = 200;\n    cout<<number1<<" "<<number2<<endl;\n    int temp = number1;\n    number1 = number2;\n    number2 = temp;\n    cout<<number1<<" "<<number2<<endl;\n    return 0;\n}<\/code><\/pre>\n
    Output:<\/strong><\/p>\n
    145 200\n200 145<\/code><\/pre>\n<\/li>\n
  6. \n
    Can you now swap two numbers without a third variable?<\/strong>
    \nAns.<\/strong> (use the difference and sum operation)<\/p>\n
    #include \nusing namespace std;\nint main() {\n    int number1 = 145;\n    int number2 = 200;\n    cout<<number1<<" "<<number2<<endl;\n    number1 = number1 + number2;\n    number2 = number1 - number2;\n    number1 = number1 - number2;\n    cout<<number1<<" "<<number2<<endl;\n    return 0;\n}<\/code><\/pre>\n
    Output:<\/strong><\/p>\n
    145 200\n200 145<\/code><\/pre>\n<\/li>\n
  7. \n
    Can you check whether a number is prime or not?<\/strong>
    \nAns.<\/strong> (simple check whether all number below it can divide it or not)<\/p>\n
    #include \nusing namespace std;\nint main() {\n    int a = 23;\n    int b = 2;\n    \/\/start from b as 1 can divide any number\n    bool prime = true;\n    while(b!=a){\n        if(a%b == 0)\n            {\n                prime = false;\n                break;\n            }\n        b++;\n    }\n    if(prime)\n    cout<<"prime";\n    else cout<<"not prime";\n    return 0;\n}<\/code><\/pre>\n
    Output:<\/strong><\/p>\n
    prime<\/code><\/pre>\n<\/li>\n
  8. \n
    Write a program to find the reverse of a number.<\/strong>
    \nAns.<\/strong> (try to get each digit and multiply with its corresponding power of 10) <\/p>\n
    #include \nusing namespace std;\nint main() {\n    int a = 1223;\n    int res = 0;\n    while(a!=0){\n        int dig = a%10;\n        res = res*10 + dig;\n        a =a\/10;\n    }\n    cout<<res;\n    return 0;\n}<\/code><\/pre>\n
    Output:<\/strong><\/p>\n
    3221<\/code><\/pre>\n<\/li>\n
  9. \n
    Now when you know to reverse a number, can you try to check whether a number is a palindrome or not?<\/strong>
    \nAns.<\/strong> (Palindrome is a number which when reversed we get the same value)<\/p>\n
    #include \nusing namespace std;\nint reverse(int a){\n    int res = 0;\n    while(a!=0){\n        int dig = a%10;\n        res = res*10 + dig;\n        a =a\/10;\n    }\n    return res;\n}\nint main() {\n    int a = 1221;\n    int b = reverse(a);\n    if(a == b)\n        cout<<"Palindrome";\n    else\n        cout<<"Not palindrome";\n    return 0;\n}<\/code><\/pre>\n
    Output:<\/strong><\/p>\n
    Palindrome<\/code><\/pre>\n<\/li>\n
  10. \n
    Find the factorial of a number.<\/strong>
    \nAns.<\/strong> (Factorial of n = 12<\/em>34<\/em>5\u2026(n-1) <\/em>n, multiply all number below given numbers)<\/p>\n
    #include \nusing namespace std;\nint factorial(int n){\n    int res = 1;\n    for(int i = 2;i<=n;i++)\n        res = res*i;\n    return res;\n}\nint main() {\n    int a = 5;\n    cout<<factorial(a)<<endl;\n    return 0;\n}<\/code><\/pre>\n
    Output:<\/strong><\/p>\n
    120<\/code><\/pre>\n<\/li>\n
  11. \n
    Write a C++ program to check whether a number is Armstrong number or not.<\/strong>
    \nAns.<\/strong> (An Armstrong number is a number that is equal to the sum of cubes of its digits. Extract each digit and add their cubes)<\/p>\n\t\t\t\t\t\t