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inference pi,Gregory's formula
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| program pi; | |
| const c=0.5E-7; | |
| var a,sum:real; | |
| b:integer; | |
| n:longint; | |
| begin | |
| a:=1.0; | |
| sum:=1.0; | |
| b:=-1; | |
| n:=1; | |
| repeat | |
| a:=b/(2*n+1); | |
| sum:=sum+a; | |
| b:=-b; | |
| n:=n+1 | |
| until | |
| abs(a)<=c; | |
| sum:=4*sum; | |
| writeln('pi= ',sum); | |
| end. |
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