Giúp e viết ctrinh lệnh while vs for vs ạ😢😢

2 câu trả lời

viết chương trình lệnh while...for:

For

Program phtvs;

Uses Crt;

Var a,i:byte;

Begin

a:=10;

For i:=1 to 10 do a:=a+1;

End.

→ While

Program phtvs;

Uses Crt;

Var a,i:byte;

Begin

a:=10;

While i>1 do a:=a+1;

End.

Cấu trúc lệnh while..do..:

while <điều kiện> do <câu lệnh>;

giải thích: nếu điều kiện đúng, câu lệnh ddc thực hiện, sau đó lại lặp lại cho đến khi điều kiện sai

VD:

n:=10;

while n>0 do n:=n-1;

Cấu trúc lệnh for..to..do..:

for <biến 1>:=<giá trị 1> to <giá trị 2> do <câu lệnh>;

giải thích: lặp đi lặp lại câu lệnh n lần (n=giá trị 2-giá trị 1)

VD:

a:=10;

for i:=1 to 5 do a:=a-1;

Câu hỏi trong lớp Xem thêm

giup e voi I/ Supply the correct form of the verbs in brackets 1. You (think) ……………………… collecting stamps costs much money? 2. Every year, my mother (give) ……………………… me a nice doll on my birthday. 3. Jenny says she loves collecting pens but she (not/continue) ……………………… this hobby from next year. 4. If you wash your hands more, you (have)……………………. less chance of catching flu. 5. Getting plenty of rest is very good. It (help)…………………. you to avoid depression. 6. Mr. John (be) ……………………… principal of our school since last year. 7. I (see) ……………………… a car accident on this corner yesterday. 8. We like (come)……………………to school by bus, but we hate (stand)………………………. and (wait) …………………… in the rain. 9. ……………………… (you/ ever/ meet) anyone famous? 10. My mother (come) ……………………… to stay with us next weekend. 11. When he lived in Manchester, he (work) ……………………… in a bank. 12. We (be) ……………………… students for four years. 13. We are planting trees around our school now. Our school (be) ……………………… surrounded by a lot of green trees. 14. What ……………………… your father usually ……………………… (do) in the evenings? 15. My sister likes (cook) ……………………… very much. She can cook many good foods. 16. My father says when he's retired, he (go) …………………… back to his village to do the gardening. 17. They want (buy) ……………………… some meat for dinner. 18. Linh is my best friend. We (know) ……………………… each other for 5 years. 19. I enjoy (fish) ……………………… because it is relaxing. 20. How about (go) ……………………… to the movie theatre?

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