A file keeps data after a program stops. A program reads it row by row.
A variable forgets when the program stops. A file is saved on the computer, so it is still there tomorrow.
Think of a file as a folder full of rows. Each row is one line of data, like Monday and one thousand steps.
A program opens the file, reads a row and uses it. It repeats this for every row, starting from the top, and then closes the file.
If a row has a mistake, the chart will show it.
These are some of the questions on the sets. The printable sheets have more and an answer key.
A file. A variable forgets when the program stops.
One row. A file is a folder full of rows.
Close the file. Open, read, use, and then close.
At that bar's row in the file. Each bar comes from one row, so a mistake shows in the chart.
Friday. Nine hundred is less than a thousand.
Each night for a week, write one row in a notebook: the day, and one number, like how many pages you read. The notebook is your file, and it remembers. At the end of the week, read it row by row and draw a bar for each day. Does any row look odd?
Do the notebook Mission: write one row a night for a week, the day and one number, then read it row by row at the end and draw a bar for each day. Does any row look odd?
