hello can someone please explain this.

Part A (79 points) Algorithm solution (in pseudocode) 1. Declare variable inFile to get the data from an input file 2. Declare variables grade, counter, and total that hold a whole numbers. 3. Declare and initialize to zero a variable named sum that hold a whole numbers 4. Open file input9.txt 5. Check if the file was opened (if not opened, show an error message and stop the program). 6. Prompt the user to enter the number of grades to process 7. Get the value from the keyboard and store it in total. 8. Check if the value entered is outside the range (1..100). If the value is outside the range, display an error message and stop the program. 9. Set counter to 0 10. While (counter is less than total) 11 Get the value from the file and store it in grade 12. Accumulate its value in sum. 13. Increment the counter 14. Print the "The average is ", followed by the value returned by the function average (sum,total) 15. Closes the file Function average() receives the values of sum and total, calculates the average, and rounds it to the nearest whole number (ones) before returning it. Use appropriate type casting to avoid loss of information when calculating the average Part B (10 points) Modify steps 9 through 13 so that the loop is implemented with a for-loop Part C (11 points) Modify steps 6 through 8 in the above program so that, instead of stopping the program, it keeps asking the user to enter a valid value until it is entered. Note: use a do-loop. See my sample solution to see what your program must do. To clear the screen before prompting the user to enter the value use system("cls");. To pause your program so the user can read your message use systempause"); Modify step 12. so that only the passing grades (70 through 100) are considered to calculate the average. Be careful here when you calculate the average since there might be no passing grades among those