conditional statements Pascal if then else if then

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条件文（conditional statements） 条件文はPascal等では以下の形で書かれる。 if 式 then 文 else 文 入口 if 式 then 文

条件文（conditional statements） 条件文はPascal等では以下の形で書かれる。 if 式 then 文 else 文 入口 if 式 then 文 （例） if x=0 then begin x: =1; y: =3 end else x: =2 if文も、thenパートの 文とelseパートの文 がsingle entry, single exitならsingle entry, single exitである。 真 x: =1 x=0 偽 x: =2 y : = 3 出口X

break文の使用例 while x>0 do begin if x=5 then break; x : = x-1 end

break文の使用例 while x>0 do begin if x=5 then break; x : = x-1 end break文によって、 if文の出口は２ つになったが、 while文全体は single entry, single exitである。 入口 真 x=5 x>0 偽 真 偽 x : = x-1 出口

continue文の使用例 while (x>0) do begin if x 8 then begin x : = x-1;

continue文の使用例 while (x>0) do begin if x 8 then begin x : = x-1; continue end; x : = x-5 end continue文によって、if文 の出口は２つになったが、 while文全体はsingle entry, single exitである。 入口 真 x 8 真 x : = x-1 x>0 偽 偽 x : = x-5 出口

練習問題４ 以下のプログラム断片の制御フローを図示せよ。 while x>0 do begin while y>0 do begin if x 3 then

練習問題４ 以下のプログラム断片の制御フローを図示せよ。 while x>0 do begin while y>0 do begin if x 3 then begin y : = y – 1; continue end z : = z + 1; y : = y - 1 end; x : = x – 1 end

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