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 P: 90 The general format for a DO loop in FORTRAN is the following: DO 10 I=1,N,INC . . . DO SOMETHING . . . 10 CONTINUE The control variable (I in this case) is assigned an initial value of 1. N is the limiting value, so the program will break out of the loop after executing for I = N (basically, if I > N). INC is the increment value. If INC is not given in a program, it defaults to 1. If you give it the value 5, I will increase by INC each time through the loop. Hope this helps.