Answer

1. You might want to do output so that it lines up in columns. Right now you don't have much control over the spacing in a line of output.

2. You might want to do input so that you can ignore certain characters in the input. For example, imagine trying to read a social security number entered by the user as ``383-38-2839''. You might like to read the digits and ignore the hyphens.

3. You might like to perform output to a file, instead of to the display. Then the results of your program would be safely saved away.

4. You might like to perform input from a file, instead of from the keyboard.

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