Sample File to Input, area.f

We give here is the listing for a program area.f (it's Fortran but that doesn't matter). We suggest you enter this program into a file called area.f on your computer, and then use this file to try out the Unix tools and editors. It is small, you can always get it back if it gets ruined, and you can even compile and run it.

 
       PROGRAM area   	   
c area of circle, r input from terminal   	   
       DOUBLE PRECISION pi, r, A   	   
c    Best value of pi for IEEE floating point   	   
       pi = 3.14159265358979323846   	   
c 	read r from standard input (terminal)   	   
       Write(*, *) 'specify radius, e.g. 1.0 '   	   
       Read (*, *)  r   	   
       A = pi * r**2   	   
c    write area onto terminal screen   	   
       Write(*, 10) 'radius r =', r, ' A =', A   	  
 10    Format(a20, f10.5, a15, f12.7)   	   
       STOP 'area'   	   
       END

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