Answer:
The answer to this question is the option "a".
The statement for opening file can be given as:
inFile.open("progdata.dat");
Explanation:
In the above statement, this statement is part of the c++ programming language. To open any file we use the following syntax that can be given as:
Syntax:
inFile.open(filename, mode);
In the above syntax inFile.open() is a function that opens the file. In this function, we pass two parameters that are filename, mode. Where filename is the name of the file which we want to open. In the filename, we write file names with the path of the file like(C:\Users\Public\Music\Sample Music\abc.dat) where (C:\Users\Public\Music\Sample Music) is the path of the file and (abc.dat) is a file name. In the mode parameter, it provides the mode in which we want to open a file. There are two types of read mode and write mode. The default mode is read mode.
Answer:
The different variable in C is 21213316700.
Explanation:
Given value:
Total value = letters + underscore value
Total value = 52 + 1
Total value =53
choice for first character = 53 letters +10 digits
first character = 63
choice for remaining characters
So,
Variable number With one 1 character = 53
Variable number With 2 character = 53 × 63
Variable number With 3 character = 53 × 63²
Variable number With 4 character = 53 × 63³
.
.
.
Variable number With 7 character = 
Total difference variable = 53 + 53 × 63+ 53 × 63²+ 53 × 63³+....+ 
Total difference variable = 53(1 + 63 + 63²+ 63³+ .... +
)
Formula:

Total difference variable

Answer:
router.
Explanation:
Router is the main connection for a house network to the Internet, the firewall function is combined to the router. Every house network must have a firewall to protect their privacy.
The router provides the hardware firewall while the windows provides the software firewall.So the answer to this question is router.
Answer:
The correct answer to the following question will be "Server".
Explanation:
- Any device with a network connection is a host, but only hosts which accept other device connections (climates) are Servers.
- All servers were hosts, but the servers aren't all hosts.
- Each host network is a node, however not all network nodes are a host. Networking hardware such as modems, hubs, and network switches are not necessarily network addresses allocated (except for administrative purposes sometimes).
Answer:
D. Create a cell reference in a formula by typing in the cell name or clicking the cell.
Further Explanation:
To create a cell reference in a formula the following procedure is used:
First, click on the cell where you want to add formula.
After that, in the formula bar assign the equal (=) sign.
Now, you have two options to reference one or more cells. Select a cell or range of cells that you want to reference. You can color code the cell references and borders to make it easier to work with it. Here, you can expand the cell selection or corner of the border.
Again, now define the name by typing in the cell and press F3 key to select the paste name box.
Finally, create a reference in any formula by pressing Ctrl+Shift+Enter.