10 sum=sum + temp;
Fact=fact + fact;
Temp=(a + b) * 0.5;
C=SQRT (a * b);
A=temp.
Temp=fact * c * c;
If (abs (c). LE. Err) goto 20
If (temp. GT. Err * sum) goto 10
Sum=sum + 20 temp;
F=4 * atan (1.0)/(a + b);
The logic of the two if goto reason not clear, have a logical bloggers can help manage? thank you