programming C++

1. Write a program which prints - Hello World!! 2. Write a program which asks the user for an integer and outputs twice the value A. Example i. Input: Please enter a number: 42 ii. Output: The number 84 is double your input number 42 3. Write a program which asks the user for a floating-point number and outputs twice the value A. Example i. Input: Please enter a number: 42.69 ii. Output: The number 85.38 is double your input number 42.69 4. Write a program that outputs the Boolean for equality of the comparison of two user input integers A. Example 1 i. Input: - Please enter first number: 42 - Please enter second number: 42 ii. Output: - Result of comparison: I B. Example 2 i. Input: - Please enter first number: 42 - Please enter second number: 84 ii. Output: - Result of comparison:0