Write a C++ Program to create a pointer that points to a structure. It is similar to how pointers pointing to native data types like int, float, double, etc. are created. A pointer in C++ will store a memory location. Following steps should be followed to perform a task.

• Start of the body of the struct name Length.
• Create a struct member named meters of integer data type and centimeters of float data type.
• End of the body of the struct Length.
• Call the main () function.
• Create a pointer variable *ptr and normal variable l of type Length. Store the address of variable l in our pointer variable.
• Take user input of meter and centimeter through *ptr.
• Print the length in meters and in centimeters through using *ptr.

write a C++ program to Create a time class that includes integer member values for hours, minutes,and seconds.
Make a member function get_time() that gets a time value from the user, and a function
put_time() that displays a time in 12:59:59 format. Add error checking to the get_time()
function to minimize user mistakes. This function should request hours, minutes, and seconds
separately,
and check each one for ios error status flags and the correct range. Hours
should be between 0 and 23, and minutes and seconds between 0 and 59. Don’t input these
values as strings and then convert them; read them directly as integers. This implies that
you won’t be able to screen out entries with superfluous decimal points, as does the
ENGL_IO program in this chapter, but we’ll assume that’s not important.
In main(),use a loop to repeatedly get a time value from the user with get_time() and
then display it with put_time(), like this:
Enter hours: 11
Enter minutes: 59
Enter seconds: 59
time = 11:59:59
Do another (y/n)? y
Enter hours: 25
Hours must be between 0 and 23
Enter hours: 1
Enter minutes: 10
Enter seconds: five
Incorrect seconds input
Enter seconds: 5
time = 1:10:05

note: use OOP concepts

Write a C++ program to create a menu based calculator. Your program should perform the
following features:
+ , -, ×, ÷, log, Mod, √, 10x
, X3
, √?
?
, √?
?
, Xy
, X2
, Exp, sin, cos, tan, Inv (for sin, cos and tan).
Your program should be well thought and should not leave any possibility. For instance, it should not
only add two numbers t should add two or more numbers. Your program should first print a menu
displaying different options for user. Your program should look like as follows:
Calculator by your name
1. Addition (+)
2. Subtraction (-)
3. Multiplication (×)
4. Division (÷)
5. Log
6. Modular (Mod)
7. Square root (√)