A; B; C
begin

end


A; B; C
A
begin

end

B
C

A; B; C
A
begin

end

B
C
p1
A
p1p2
B
p2
C
p1
p2

A; B; C
A
p0
p3
B
C
p0p1
A
p1p2
B
p2p3
C
p1
p2
p0p3
A; B; C
if (P) then
A; B
else
C
endif
begin

end

begin

end

if
A; B
PP = true P = false
C
begin

end

if
A; B
PP = true P = false
C
1: P
A; B
2: P
C
while (P) do
A; B; C
endwhile
begin

end

begin

end

while
A; B; C
P P = true
P = false
begin

end

while
A; B; C
P P = true
P = false
I
1: I
3: IP
2: IPI
A; B; Cskip
skip