'How to draw a Control Flow Graph for the following piece of code?

L1: input(a, b, c)
L2: d <- b * b -4 * a * c;
L3: if ( d>0 ) then
L4:     r <- 2
L5: else_if ( d=0 ) then
L6:     r <- 1
L7: else_if ( d<0 ) then
L8:     r ,_ 0;
L9: output(r)

How do I draw Control Flow Graph from this code? It's not a homework question, I just try to understand the course material. Thanks.

graphcontrol-flow-graph


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