Graph with no options takes pairs of points (two numbers per line) from

　　the given file (or standard input) as x- and y- values and plots them

　　on the screen, connected by straight lines. A string surrounded by

　　quotes "..." may follow a pair of points, and will be displayed

　　starting at that point. If an input file is specified, the program

　　waits for a keypress, then resets the screen parameters and clears the

　　screen before exiting. If the data comes from the standard input, the

　　program exits without clearing the screen or resetting it

-Graph with no options takes pairs of points (two numbers per line) from the given file (or st andard input) as x-and y-values and plots them o n the screen. connected by straight lines. A string surround ed by quotes "..." may follow a pair of points. and will be displayed starting at that point. If an input file is specified, the program waits for a keypress. then resets the screen parameters and clears th e screen before exiting. If the data comes from t he standard input, the program exits without clearing the screen o r resetting it