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- write a program that reads in the radius and computes the
area of a circle;
- extend the program to test whether the area is negative; if so
just STOP. This introduces IF blocks, and logical expressions;
- extend the program to read 5 radii; this introduces a DO loop and
integer variables; CYCLE and EXIT.
- extend the code to first read all 5 radii and then compute all
5 areas; this introduces arrays. The dimension (N=5) is a PARAMETER.