The brightness of a binary star varies as follows. At time t = 0 days its magnit
ID: 3861841 • Letter: T
Question
The brightness of a binary star varies as follows. At time t = 0 days its magnitude is 2.5, and it stays at this level until t = 0.9 days. Its magnitude is then determined by the formula 3.355 - In(1.352 + cos(pi(t - 0.9)/0.7)) Until t = 2.3 days its magnitude is then 2.5 until t = 4.4 days, and it is then determined by the formula 3.598 - In(1.998 + cos(pi(t - 4.4)/0.4)) Until t = 5.2. It then remains at 2.5 until t = 6.4 days, after which the cycle repeats with a period of 6.4 days. write a program which will input the value of t and print the brightness of the star at that time. Use the value of pi = 3.14285714. Your program should give the user the option to repeat the process of computing the brightness of star or stop (EXIT) the code. Also, you should use nested if, switch control structure statements in your solution as described in the table below. Your results should be displayed in five decimal places.Explanation / Answer
Parameters
hDevice
A handle to the \.LCD device. To retrieve a device handle, call the CreateFile function.
dwIoControlCode
The control code for the operation. This value identifies the specific operation to be performed and the type of device on which to perform it. Use IOCTL_VIDEO_QUERY_DISPLAY_BRIGHTNESS for this operation.
lpInBuffer
Not used with this operation; set to NULL.
nInBufferSize
Not used with this operation; set to zero.
lpOutBuffer
A pointer to a buffer that will receive a DISPLAY_BRIGHTNESS structure.
nOutBufferSize
The size of the output buffer, in bytes.
lpBytesReturned
A pointer to a variable that receives the size, in bytes, of output data returned.
If the output buffer is too small to return any data, then the call fails, GetLastError returns the error code ERROR_INSUFFICIENT_BUFFER, and the returned byte count is zero.
If the output buffer is too small to hold all of the data but can hold some entries, then the operating system returns as much as fits, the call fails, GetLastError returns the error code ERROR_MORE_DATA, and lpBytesReturned indicates the amount of data returned. Your application should call DeviceIoControl again with the same operation, specifying a new starting point.
If lpOverlapped is NULL (nonoverlapped I/O), lpBytesReturned cannot be NULL.
If lpOverlapped is not NULL (overlapped I/O), lpBytesReturned can be NULL. If this is an overlapped operation, you can retrieve the number of bytes returned by calling the GetOverlappedResult function. If hDevice is associated with an I/O completion port, you can get the number of bytes returned by calling the GetQueuedCompletionStatus function.
lpOverlapped
A pointer to an OVERLAPPED structure.
If hDevice was opened with the FILE_FLAG_OVERLAPPED flag, lpOverlapped must point to a valid OVERLAPPED structure. In this case, the operation is performed as an overlapped (asynchronous) operation. If the device was opened with the FILE_FLAG_OVERLAPPED flag and lpOverlapped is NULL, the function fails in unpredictable ways.
If hDevice was opened without specifying the FILE_FLAG_OVERLAPPED flag, lpOverlapped is ignored and DeviceIoControl does not return until the operation has been completed, or until an error occurs.
Return value
If the operation completes successfully, DeviceIoControl returns a nonzero value.
If the operation fails or is pending, DeviceIoControl returns zero. To get extended error information, call GetLastError.
Remarks
The header file used to build applications that include this functionality, Ntddvdeo.h, is included in the Microsoft Windows Driver Development Kit (DDK). For information on obtaining the DDK, see http://www.microsoft.com/whdc/devtools/ddk/default.mspx.
Alternatively, you can define this control code as follows:
the code is as follows:-
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