In C$++$ create an input file called indata.txt that has the following data:

David Smith $899092$

Amy Davidson $785623$

Jenny Akers $757967$

David Lopez $888079$

The file shows first and last name of four students in a class. The next $3$ numbers

are scores from three different tests that were out of $100.$ You need to find the

average of these three scores and then use the average to find the grade for the

student based on this table.

Average Score Grade

$90100$ A

$8089$ B

$7079$ C

$6069$ D

$059$ F

You should write the information read from the input file to an output file called

grades.txt$.$ You may also write data to the screen.

In addition, add average score then followed by the grade.

Hence, for the input file given above, the output file should be like this.

David Smith $89909290\mathrm{.}3$ A

Amy Davidson $78562352\mathrm{.}3$ F

Jenny Akers $75796773\mathrm{.}6$ C

David Lopez $88807982\mathrm{.}3$ B

Use functions in your program if you can. Otherwise, it will be fine in this program

to find the solution without using any functions.

Add pre$-$conditions and post$-$conditions documentation to your function.

You may use same test values shown above.

Remember to use meaningful names for your variables.