解引用運算子如何運作?

這是一個推薦產品對話框
熱門建議
起價
查看全部 >
語言
French
English
ไทย
German
繁體中文
國家/地區
All
登入/建立帳戶
language Selector,${0} is Selected
註冊並於Lenovo Pro 商務採購商店購物
於Lenovo教育商店註冊

專業等級福利

• 在 Think 每日價格上節省高達額外 3%
• 消費滿HK$78,000,晉升至 Plus 等級,享有更多福利

Plus 等級福利

• 在 Think 每日價格上節省高達額外 5%
• 消費滿HK$120,000,免費升級至擁有更多福利的菁英等級
等菁英級福利
• 在Think日常價格上節省高達額外8%
經銷商福利
• 可獲得Lenovo全系列產品的使用權
• 配置和購買價格優於Lenovo.com
查看所有詳情 >
再多達到
PRO Plus
PRO 菁英
恭喜,您已達到菁英地位!
Pro for Business
Delete icon Remove icon Add icon Reload icon
即將上市
已停產
暫時無法使用
Cooming Soon!
. Additional units will be charged at the non-eCoupon price. Purchase additional now
We're sorry, the maximum quantity you are able to buy at this amazing eCoupon price is
登入或建立帳戶以儲存您的購物車!
Sign in or Create an Account to Join Rewards
檢視購物車
Wow, your cart is empty!
移除
items in cart
Fill it in with great deals
Some items in your cart are no longer available. Please visit cart for more details.
has been deleted
Please review your cart as items have changed.
/
Contains Add-ons
繼續進行結帳
是的
Popular Searches
今天您想找什麼?
Quick Links
Recent Searches
Hamburger Menu
跳至主要內容
{"arrowColor":"#000000","backgroundColor":"#e6f4fa","divideColor":"","sideMsg":"","data":[{"pcInfo":"","mAndTabInfo":"","bannerInfo":{"t_id":"Pagec266a069-7bec-4daf-93b5-a0c03d4e4972","language":{"zh_hk":"%3Cp%20style%3D%22text-wrap%3A%20wrap%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%E5%8A%A0%E5%85%A5%20Lenovo%20Pro%20%E5%8D%B3%E5%8F%AF%E4%BA%AB%E9%AB%98%E9%81%948%E6%8A%98%E8%BF%8E%E6%96%B0%E5%84%AA%E6%83%A0%3C%2Fspan%3E%3C%2Fp%3E%3Cp%20style%3D%22text-wrap%3A%20wrap%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%E8%87%B4%E9%9B%BB%26nbsp%3B%3C%2Fspan%3E%3Cspan%20style%3D%22color%3A%20rgb(255%2C%20255%2C%20255)%3B%22%3E%3Ca%20href%3D%22tel%3A25930388%22%20style%3D%22color%3A%20rgb(255%2C%20192%2C%200)%3B%22%3E%3Cstrong%3E2593%200388%3C%2Fstrong%3E%3C%2Fa%3E%26nbsp%3B%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%E8%A7%A3%E9%8E%96%E5%84%AA%E6%83%A0%26nbsp%3B%20%26nbsp%3B%20%26nbsp%3B%26nbsp%3B%3C%2Fspan%3E%3C%2Fspan%3E%3Ca%20href%3D%22%2Fbusiness%2Fbenefits%2F%3FipromoID%3Dhellobar_01_lpro_learn%22%20target%3D%22_blank%22%20textvalue%3D%22%E5%85%8D%E8%B2%BB%E5%8A%A0%E5%85%A5%22%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%20text-decoration%3A%20underline%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cstrong%3E%E5%85%8D%E8%B2%BB%E5%8A%A0%E5%85%A5%3C%2Fstrong%3E%3Cstrong%3E%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3C%2Fp%3E","en":"","en_hk":"%3Cp%20style%3D%22text-wrap%3A%20wrap%3B%22%3E%3Cspan%20style%3D%22font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%20color%3A%20rgb(0%2C%200%2C%200)%3B%22%3EJoin%20Lenovo%20Pro%20for%20up%20to%2010%25%20Welcome%20Discount.%3C%2Fspan%3E%3C%2Fp%3E%3Cp%20style%3D%22text-wrap%3A%20wrap%3B%22%3E%3Ca%20href%3D%22tel%3A25930388%22%20style%3D%22color%3A%20rgb(255%2C%20255%2C%20255)%3B%20font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(255%2C%20192%2C%200)%3B%22%3E%3Cstrong%3ECall%202593%200388%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3Cspan%20style%3D%22font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%22%3E%3Cstrong%3E%3Cspan%20style%3D%22font-family%3A%20Montserrat%3B%20color%3A%20rgb(255%2C%20255%2C%20255)%3B%22%3E%26nbsp%3B%20%26nbsp%3B%20%26nbsp%3B%3C%2Fspan%3E%3C%2Fstrong%3E%26nbsp%3B%3C%2Fspan%3E%3Ca%20href%3D%22%2Fbusiness%2Fbenefits%2F%3FipromoID%3Dhellobar_01_lpro_learn%22%20target%3D%22_self%22%20textvalue%3D%22Join%20For%20Free%22%3E%3C%2Fa%3E%3Ca%20href%3D%22%2Fbusiness%2Fbenefits%2F%3FipromoID%3Dhellobar_01_lpro_learn%22%20target%3D%22_blank%22%20textvalue%3D%22JOIN%20FOR%20FREE%22%20style%3D%22text-decoration%3A%20underline%3B%20color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cstrong%3E%3Cstrong%3EJoin%20For%20Free%3C%2Fstrong%3E%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3C%2Fp%3E","zh":""},"id":"Pagec266a069-7bec-4daf-93b5-a0c03d4e4972"},"gInfo":""},{"pcInfo":"","mAndTabInfo":"","bannerInfo":{"t_id":"Page18602d9a-68c6-4e21-8ef9-541ce5469e4d","language":{"zh_hk":"%3Cp%20style%3D%22text-wrap%3A%20wrap%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%E5%8A%A0%E5%85%A5%20Lenovo%20Edu%EF%BC%8C%E5%8D%B3%E4%BA%AB%E9%AB%98%E9%81%94%24800%E8%BF%8E%E6%96%B0%E6%8A%98%E6%89%A3%3C%2Fspan%3E%3C%2Fp%3E%3Cp%20style%3D%22text-wrap%3A%20wrap%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%E8%87%B4%E9%9B%BB%3C%2Fspan%3E%3Cspan%20style%3D%22color%3A%20rgb(255%2C%20255%2C%20255)%3B%22%3E%26nbsp%3B%3Ca%20href%3D%22tel%3A25930388%22%20style%3D%22color%3A%20rgb(255%2C%20192%2C%200)%3B%20text-decoration%3A%20underline%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(255%2C%20192%2C%200)%3B%22%3E%3Cstrong%3E%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3Cstrong%3E%3Ca%20href%3D%22tel%3A25930388%22%20style%3D%22text-wrap%3A%20wrap%3B%20color%3A%20rgb(255%2C%20192%2C%200)%3B%22%3E%3Cstrong%3E2593%200388%3C%2Fstrong%3E%3C%2Fa%3E%3C%2Fstrong%3E%3C%2Fspan%3E%26nbsp%3B%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%E8%A7%A3%E9%8E%96%E5%84%AA%E6%83%A0%26nbsp%3B%3C%2Fspan%3E%26nbsp%3B%20%26nbsp%3B%3Ca%20href%3D%22%2Flenovo-edu%2Fstudent%2Fbenefits%2F%3FipromoID%3Dhellobar_02_edu%22%20target%3D%22_blank%22%20textvalue%3D%22%E5%85%8D%E8%B2%BB%E5%8A%A0%E5%85%A5%22%20style%3D%22text-decoration%3A%20underline%3B%20color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cstrong%3E%E5%85%8D%E8%B2%BB%E5%8A%A0%E5%85%A5%3C%2Fstrong%3E%3Cstrong%3E%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%26nbsp%3B%3C%2Fspan%3E%3C%2Fp%3E","en":"","en_hk":"%3Cp%20style%3D%22text-wrap%3A%20wrap%3B%22%3EJoin%20Lenovo%20Edu%20and%20enjoy%20up%20to%20%24800%20Welcome%20Discount%3C%2Fp%3E%3Cp%20style%3D%22text-wrap%3A%20wrap%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(255%2C%20192%2C%200)%3B%20font-family%3A%20Montserrat%3B%22%3E%26nbsp%3B%3Ca%20href%3D%22tel%3A25930388%22%20style%3D%22color%3A%20rgb(255%2C%20192%2C%200)%3B%20text-decoration%3A%20underline%3B%22%3E%3Cstrong%3E%3C%2Fstrong%3E%3C%2Fa%3E%3Cstrong%3E%3Ca%20href%3D%22tel%3A25930388%22%20style%3D%22text-wrap%3A%20wrap%3B%20color%3A%20rgb(255%2C%20255%2C%20255)%3B%20font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(255%2C%20192%2C%200)%3B%22%3E%3Cstrong%3ECall%202593%200388%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3C%2Fstrong%3E%26nbsp%3B%20%26nbsp%3B%3Ca%20href%3D%22%2Flenovo-edu%2Fstudent%2Fbenefits%2F%3FipromoID%3Dhellobar_02_edu%22%20target%3D%22_blank%22%20textvalue%3D%22Join%20For%20Free%22%20style%3D%22text-decoration%3A%20underline%3B%20color%3A%20rgb(0%2C%200%2C%200)%3B%20font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%20font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%22%3E%3Cstrong%3EJoin%20For%20Free%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3C%2Fspan%3E%3C%2Fp%3E","zh":""},"id":"Page18602d9a-68c6-4e21-8ef9-541ce5469e4d"},"gInfo":""},{"pcInfo":"","mAndTabInfo":"","bannerInfo":{"t_id":"Page375ea481-5f97-4833-86ce-42c3842dc33f","language":{"zh_hk":"%3Cp%3E%3Cspan%20style%3D%22text-wrap%3A%20wrap%3B%20font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%20color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%E6%9C%89%E7%96%91%E5%95%8F%E5%97%8E%EF%BC%9F%20%E5%A6%82%E9%9C%80%E6%88%91%E5%80%91%E7%9A%84%E5%B0%88%E5%AE%B6%E5%BB%BA%E8%AD%B0%EF%BC%8C%E8%AB%8B%E8%87%B4%E9%9B%BB%3C%2Fspan%3E%3Cspan%20style%3D%22text-wrap%3A%20wrap%3B%20color%3A%20rgb(255%2C%20255%2C%20255)%3B%20font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%22%3E%26nbsp%3B%3Ca%20href%3D%22tel%3A25930388%22%20style%3D%22color%3A%20rgb(255%2C%20255%2C%20255)%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(255%2C%20192%2C%200)%3B%22%3E%3Cstrong%3E2593%200388%3C%2Fstrong%3E%3C%2Fspan%3E%3Cspan%20style%3D%22text-wrap%3A%20wrap%3B%20font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%20color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cstrong%3E%E6%88%96%E9%BB%9E%E6%93%8A%E3%80%8C%E8%81%8A%E5%A4%A9%E3%80%8D%EF%BC%81%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3C%2Fspan%3E%3Cspan%20style%3D%22text-wrap%3A%20wrap%3B%20font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%20color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%26nbsp%3B%26nbsp%3B%3C%2Fspan%3E%3Ca%20target%3D%22_self%22%20class%3D%22live_chat_daily%22%20style%3D%22text-wrap%3A%20wrap%3B%20text-decoration%3A%20underline%3B%20font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%20color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cstrong%3E%E8%81%AF%E7%B5%A1%E6%88%91%E5%80%91%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3C%2Fp%3E","en":"","en_hk":"%3Cp%3E%3Cspan%20style%3D%22text-wrap%3A%20wrap%3B%20font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%20color%3A%20rgb(0%2C%200%2C%200)%3B%22%3ENeed%20Help%3F%3C%2Fspan%3E%3Cspan%20style%3D%22text-wrap%3A%20wrap%3B%20color%3A%20rgb(255%2C%20255%2C%20255)%3B%20font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%22%3E%26nbsp%3B%26nbsp%3B%3Ca%20href%3D%22tel%3A25930388%22%20style%3D%22color%3A%20rgb(255%2C%20192%2C%200)%3B%22%3E%3Cstrong%3ECall%202593%200388%3C%2Fstrong%3E%3C%2Fa%3E%26nbsp%3B%26nbsp%3B%3C%2Fspan%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cspan%20style%3D%22text-wrap%3A%20wrap%3B%20font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%22%3Eor%20Chat%20with%20us%20now!%3C%2Fspan%3E%3Cspan%20style%3D%22text-wrap%3A%20wrap%3B%20font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%22%3E%26nbsp%3B%26nbsp%3B%3C%2Fspan%3E%3C%2Fspan%3E%3Ca%20target%3D%22_self%22%20class%3D%22live_chat_daily%22%20style%3D%22text-wrap%3A%20wrap%3B%20text-decoration%3A%20underline%3B%20font-family%3A%20arial%2C%20helvetica%2C%20sans-serif%3B%20color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cstrong%3EContact%20Us%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3C%2Fp%3E","zh":""},"id":"Page375ea481-5f97-4833-86ce-42c3842dc33f"},"gInfo":""},{"pcInfo":"","mAndTabInfo":"","bannerInfo":{"t_id":"Pagec0411f05-77c5-4cd9-b86d-ae703825f74e","language":{"zh_hk":"%3Cp%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cstrong%3E%3C%2Fstrong%3E%3Cstrong%3E%E3%80%90%E5%B9%B4%E4%B8%AD%E9%96%8B%E5%80%89%E5%8B%81%E6%B8%9B%E3%80%91%3C%2Fstrong%3E%20%E9%9B%BB%E8%85%A6%E4%BD%8E%E8%87%B36%E6%8A%98!%20%E4%BD%BF%E7%94%A8%E5%84%AA%E6%83%A0%E7%A2%BC%20%26%2339%3BMIDYEARHK%26%2339%3B%20%E9%A1%8D%E5%A4%96%E6%9C%80%E5%A4%9A%E6%B8%9B%241%2C000%26nbsp%3B%20%26nbsp%3B%20%26nbsp%3B%26nbsp%3B%3C%2Fspan%3E%3Ca%20href%3D%22%2Fd%2Fdeals%2Fspecial-offer%2F%3FipromoID%3Dhellobar_sitewide_promo%22%20target%3D%22_self%22%20textvalue%3D%22%E6%9C%83%E5%93%A1%E7%8E%87%E5%85%88%E6%90%B6%E8%B3%BC%22%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%20text-decoration%3A%20underline%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cstrong%3E%E6%9C%83%E5%93%A1%E7%8E%87%E5%85%88%E6%90%B6%E8%B3%BC%3C%2Fstrong%3E%3Cstrong%3E%3C%2Fstrong%3E%3Cstrong%3E%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3C%2Fp%3E","en":"","en_hk":"%3Cp%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3C%2Fspan%3E%3C%2Fp%3E%3Cp%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cstrong%3E%3C%2Fstrong%3E%3Cstrong%3E%E3%80%90Mid-Year%20Mega%20Sale%E3%80%91%3C%2Fstrong%3EPCs%20up%20to%2040%25%20off.%20Use%20coupon%20code%20%26%2339%3BMIDYEARHK%26%2339%3B%20to%20save%20up%20to%20extra%20%241%2C000%26nbsp%3B%20%26nbsp%3B%20%26nbsp%3B%26nbsp%3B%3C%2Fspan%3E%3Ca%20href%3D%22%2Fd%2Fdeals%2Fspecial-offer%2F%3FipromoID%3Dhellobar_sitewide_promo%22%20target%3D%22_self%22%20textvalue%3D%22Exclusively%20for%20Members%22%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%20text-decoration%3A%20underline%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cstrong%3EExclusively%20for%20Members%3C%2Fstrong%3E%3Cstrong%3E%3C%2Fstrong%3E%3Cstrong%3E%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3C%2Fp%3E","zh":""},"id":"Pagec0411f05-77c5-4cd9-b86d-ae703825f74e"},"gInfo":""},{"pcInfo":"","mAndTabInfo":"","bannerInfo":{"t_id":"Pagef0cac9bb-27f2-401d-ba45-29bf23daa525","language":{"zh_hk":"%3Cp%3EYoga%20Slim%207%20AI%20PC%20%7C%20%E9%80%8F%E9%81%8E%E6%90%AD%E8%BC%89Snapdragon%C2%AE%20X%20Elite%E8%99%95%E7%90%86%E5%99%A8%E7%9A%84%E5%85%A8%E6%96%B0Lenovo%20Yoga%20Slim%207x%E3%80%82%26nbsp%3B%20%26nbsp%3B%3Ca%20href%3D%22%2Fp%2Flaptops%2Fyoga%2Fai-pc-series%2Fyoga-slim-7x-gen-9-(14-inch-qualcomm)%2Flen101y0049%3FipromoID%3Dhellobar_05_AI_PC%22%20target%3D%22_self%22%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cstrong%3E%E7%AB%8B%E5%8D%B3%E9%A0%90%E8%A8%82%3C%2Fstrong%3E%3C%2Fa%3E%3C%2Fp%3E","en":"","en_hk":"%3Cp%3EYoga%20Slim%207%20AI%20PC%20%7C%20Level%20up%20your%20creativity%20with%20next-gen%20AI%20experiences%20on%20the%20new%20Lenovo%20Yoga%20Slim%207x.%26nbsp%3B%20%26nbsp%3B%3Ca%20href%3D%22%2Fp%2Flaptops%2Fyoga%2Fai-pc-series%2Fyoga-slim-7x-gen-9-(14-inch-snapdragon)%2Flen101y0049%3FipromoID%3Dhellobar_05_AI_PC%22%20target%3D%22_self%22%20textvalue%3D%22Pre-order%20Now%22%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%20text-decoration%3A%20underline%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cstrong%3EPre-order%20Now%3C%2Fstrong%3E%3Cstrong%3E%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3C%2Fp%3E","zh":""},"id":"Pagef0cac9bb-27f2-401d-ba45-29bf23daa525"},"gInfo":""}],"autoRun":true,"displayTerminal":"pc,tablet,mobile","isShowDivide":true}

解引用運算子如何運作?

當您對指標使用取消引用運算子時,它會檢索儲存在該指標指向的記憶體位置的值。它允許您存取和操作實際數據而不僅僅是記憶體位址。

使用取消引用運算子的範例是什麼?

假設您有一個指向整數值的指標變數 ptr。如果要存取儲存在該記憶體位置的值,可以使用解引用運算符,如下所示:*ptr。這將為您提供整數的實際值。

如果我對空指標使用取消引用運算子會發生什麼?

對空指標使用取消引用運算子可能會導致程式出現執行時間錯誤或崩潰。在取消引用之前,確保指標指向有效的記憶體位置非常重要。

使用解引用運算子時是否有任何安全性問題?

是的,使用取消引用運算子有安全性問題。如果錯誤地取消引用未初始化或無效的指針,可能會導致未定義的行為,從而導致程式崩潰、記憶體損壞或其他意外問題。在取消引用之前小心處理指標並確保其有效性至關重要。

所有程式語言都使用解引用運算子嗎?

解引用運算子通常用於支援指標的程式語言,例如 C 和 C++。但是,並非所有程式語言都具有明確指標類型或支援直接記憶體操作,因此取消引用運算子的使用可能會有所不同。

解引用運算子與位址運算子有何不同?

解引用運算子 (*) 和取址運算子 (&) 是互補的。取址運算子用於取得變數的記憶體位址,而解引用運算子用於存取儲存在指標指向的記憶體位址處的值。在某種程度上,他們的工作方向相反。

如何在 C++ 中宣告和分配指標?

在 C++ 中,可以透過在變數名稱前使用星號 (*) 來宣告指針,如下所示: int* ptr;這將 ptr 聲明為指向整數的指標。若要為指標賦值,可以對變數使用取址運算子 (&),例如 ptr = &myVariable;,其中 myVariable 是要在 ptr 中儲存其位址的變數。

取消引用指標意味著什麼?

取消引用指標表示存取儲存在該指標指向的記憶體位址處的值。它允許您使用實際數據而不僅僅是內存位置。透過使用解引用運算子 (*),您可以擷取和操作指標指向的值。

解引用運算子有任何實際用例嗎?

是的,解引用運算子通常用於需要直接記憶體操作的場景,例如動態記憶體分配、鍊錶等資料結構以及使用陣列。它允許您透過指標間接存取和修改數據,從而為某些程式設計任務提供靈活性和效率。

對數組使用取消引用運算符的範例是什麼?

假設您有一個名為 myArray 的整數數組,並且您想要存取特定索引處的值。您可以使用取址運算子建立指向數組第一個元素的指針,如下所示:int* ptr = &myArray[0];。然後,您可以使用取消引用運算子來存取特定索引處的值,例如 *(ptr + 3),這將為您提供 myArray 的第四個索引處的值。

使用解引用運算子時是否有任何潛在的陷阱需要注意?

是的,使用解引用運算子存在一些缺陷。一個常見的錯誤是在取消引用指標之前忘記初始化它,這可能會導致未定義的行為。此外,取消引用指向不正確類型的指標或不正確地計算記憶體偏移量也可能引入錯誤或導致記憶體損壞。務必謹慎並仔細檢查指針的使用情況,以避免此類陷阱。

指標和解引用運算子之間有什麼關係?

指標和解引用運算子齊頭並進。指標可讓您儲存記憶體位址,而取消引用運算子使您可以存取指標指向的特定記憶體位址處的值。它們共同提供了一種間接操作資料並使用支援指標的程式語言中的記憶體位置的方法。

解引用運算子與物件導向程式設計有何關係?

在C++等物件導向的程式語言中,解引用運算子經常用於透過指標存取和修改物件的成員變數或呼叫物件的成員函數。透過取消引用指向物件的指針,您可以將其視為物件本身並使用其屬性和行為。

如果我嘗試取消引用空指標會發生什麼?

取消引用空指標會導致未定義的行為,這可能會導致程式崩潰或出現意外行為。在取消引用指標之前,確保指標有效且不為空非常重要。

每種程式語言都有解引用運算子嗎?

並非所有程式語言都有解引用運算子。它的可用性取決於語言及其語法。但是,許多流行語言(例如 C、C++、Java 和 Python)都支援解引用運算子或等效功能。

解引用運算子和點運算子有什麼差別?

解引用運算子 (*) 與指標一起使用來存取指標所指向的資料。另一方面,點運算子 (.) 與物件一起使用來存取其成員變數和成員函數。

有效使用解引用運算子有哪些技巧?

在取消引用指標之前,請確保指標已正確初始化且不為空。

將取消引用運算子與動態記憶體一起使用時,請注意記憶體分配和釋放。

使用描述性變數名稱來指示變數何時為指標。

避免過度或不必要地使用解引用運算符,以保持程式碼整潔和可讀。

{"pageComponentDataId":"537198bf07954-401a-b47a-087e257f1d72","pageComponentDataLangCode":"en_hk","configData":{"jumpType":"currentTab","headlineColor":"black","displayNumber":"","styleMode":"vertical","miniCardHoMode":"2","headline":"","products":[{"number":{"t_id":"len101t0102","language":{"zh_hk":"len101t0102","en":"","en_hk":"len101t0102","zh":""},"id":"Page497e178f-e4db-4b5b-b1a5-ec4687329efb"}},{"number":{"t_id":"len101t0104","language":{"zh_hk":"len101t0104","en":"","en_hk":"len101t0104","zh":""},"id":"Page9145835b-830f-4dee-9765-5a8ed87b670f"}},{"number":{"t_id":"len101t0081","language":{"zh_hk":"len101t0081","en":"","en_hk":"len101t0081","zh":""},"id":"Pagebb4de9bf-4262-41eb-9982-04bc0777035c"}},{"number":{"t_id":"len101g0036","language":{"zh_hk":"len101g0036","en":"","en_hk":"len101g0036","zh":""},"id":"Paged7259f59-5586-49c9-8b68-20a93f7b4c51"}}]},"urlPrefix":"AAAAAAALAAAG","needGetLatestTransDataKey":"needGetLatestTransDataValue","title":"glossary-right-blue-boxes-fragment","pageId":"82171833-6325-4d09-947e-5979c9876a90","urlEdit":0,"uri":"/FragmentDirectory/glossary/glossary-right-blue-boxes-fragment.frag","pageComponentId":"537198bf07954-401a-b47a-087e257f1d72","tplId":"c7389f9a-59c0-4c34-a9e1-f1c090c6ab86","pageComponentUuid":"537198bf07954-401a-b47a-087e257f1d72","targetUser":"0"}
即將上市
起價
建議售價
原價
網上售價:
建議售價
預估價值 (Estimated Value)
定價是Lenovo根據產業數據對產品價值的估算,包括第一方和第三方零售商和電商提供或估值相同或相似產品的價格。第三方經銷商數據可能不是基於實際銷售。
預估價值是Lenovo根據行業數據對產品價值的估算,包括Lenovo和/或第三方零售商和電子零售商提供或估值相同或相似產品的價格。第三方數據可能不是基於實際銷售。
Learn More
See More
See Less
查看 {0} 型號
查看 {0} 款型
Shipping options for {0}
產品編號
功能
查看更多
查看較少
比較
已加入!
好選擇!
您可以在每個產品類別(筆記本電腦、桌上型電腦等)中比較最多 4 項產品。請取消選擇一項才能新增另一項。
檢視您的比較
加入購物車
加入購物車
我們很抱歉,
產品暫時無法使用。
繼續購物
了解更多
即將上市
精選產品
精選產品
哎呀!未找到任何結果。請瀏覽上方的類別以尋找您的產品。
節省
open in new tab
© 2024 Lenovo. 保留所有權利。
© {year} Lenovo. All rights reserved.
比較  ()
x