什麼是程式設計遞減?

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":"Pagebe8ab402-8e6c-46ec-b36a-89db02f0c0dd","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":"Pagebe8ab402-8e6c-46ec-b36a-89db02f0c0dd"},"gInfo":""},{"pcInfo":"","mAndTabInfo":"","bannerInfo":{"t_id":"Page40cf68dc-1adb-4e27-90e7-c8ba0ea7950a","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":"Page40cf68dc-1adb-4e27-90e7-c8ba0ea7950a"},"gInfo":""},{"pcInfo":"","mAndTabInfo":"","bannerInfo":{"t_id":"Page9809461f-6acd-4464-af0b-eb1e7abf6b80","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":"Page9809461f-6acd-4464-af0b-eb1e7abf6b80"},"gInfo":""},{"pcInfo":"","mAndTabInfo":"","bannerInfo":{"t_id":"Page1ccb434c-b228-4df4-afb9-c5810d7a5468","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%20text-decoration%3A%20underline%3B%22%3E%3Cspan%20style%3D%22color%3A%20rgb(0%2C%200%2C%200)%3B%22%3E%3Cstrong%3E%E7%AB%8B%E5%8D%B3%E9%81%B8%E8%B3%BC%3C%2Fstrong%3E%3C%2Fspan%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%3EBuy%20Now%3C%2Fstrong%3E%3Cstrong%3E%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3C%2Fp%3E","zh":""},"id":"Page1ccb434c-b228-4df4-afb9-c5810d7a5468"},"gInfo":""},{"pcInfo":"","mAndTabInfo":"","bannerInfo":{"t_id":"Pagec8fc5979-2f4c-48c6-b247-2e5e018d3b23","language":{"zh_hk":"%3Cp%3E%E6%96%B0%E5%88%B0%E8%B2%A8%E5%93%81%20%7C%20%E6%8E%A2%E7%B4%A2%E6%88%91%E5%80%91%E6%9C%80%E6%96%B0%E7%9A%84%20Yoga%E3%80%81Legion%E3%80%81ThinkPad%20%E8%88%87%20IdeaPad%20%E7%B3%BB%E5%88%97%26nbsp%3B%20%26nbsp%3B%3Ca%20href%3D%22%2Fd%2Fdeals%2Fnew-arrival%2F%3FipromoID%3Dhellobar_New_Arrivals%22%20target%3D%22_self%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%E7%AB%8B%E5%8D%B3%E9%81%B8%E8%B3%BC%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3C%2Fp%3E","en":"","en_hk":"%3Cp%3ENew%20Arrivals%20%7C%20Explore%20our%20latest%20Yoga%2C%20Legion%2C%20ThinkPad%20%26amp%3B%20IdeaPad%20range.%26nbsp%3B%20%26nbsp%3B%3Ca%20href%3D%22%2Fd%2Fdeals%2Fnew-arrival%2F%3FipromoID%3Dhellobar_New_Arrivals%22%20target%3D%22_self%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%3EAll%20New%20Arrivals%3C%2Fstrong%3E%3C%2Fspan%3E%3C%2Fa%3E%3C%2Fp%3E","zh":""},"id":"Pagec8fc5979-2f4c-48c6-b247-2e5e018d3b23"},"gInfo":""}],"autoRun":true,"displayTerminal":"pc,tablet,mobile","isShowDivide":true}
6月7至9日 | 限時72小時快閃折扣!
天數
小時
分鐘
秒數


什麼是程式設計遞減?

程式設計中的遞減是指將變數的值減少特定量(通常為1)的過程。它與遞增相反,遞增值增加。遞減通常用“--”運算符表示,通常用於迴圈、條件和其他控制結構中。

遞減運算子是如何工作的?

由「--,」表示的遞減運算子從應用它的變數的當前值中減去 1。例如,如果變數“count”的值為 5,則對其使用遞減運算符 (count--) 會將該值減少到 4。這是一種從變數值中減去 1 的速記方法。

我可以在不同的程式設計語言中使用遞減嗎?

是的,遞減運算符可用於許多程式設計語言,包括 C、C++、Java、JavaScript、Python 等。但是,不同語言的語法可能略有不同。在基於 C 的語言中,它是“--”(雙減號),而在 Python 中,它是“-=”(減去和賦值)。

何時應使用遞減運算符?

當您需要反向迴圈訪問集合時,或者當您想要減小循環中變數的值直到達到特定條件時,遞減運算元非常有用。它通常用於 for 和 while 迴圈,您希望在其中根據遞減變數控制循環終止。

遞減運算子是否適用於非整數變數?

遞減運算子主要用於整數變數。雖然某些程式設計語言可能允許將其用於某些浮點或自定義數據類型,但將其與整數一起使用更安全、更可預測。對於其他數據類型,應使用特定方法或函數來實現類似的效果。

我可以同時對多個變數使用遞減運算子嗎?

否,遞減運算符一次對單個變數進行操作。如果要同時減小多個變數的值,則需要分別將遞減運算子應用於每個變數。

如果我用盡可能小的值減小一個變數,會發生什麼情況?

使用最小可能的值遞減變數可能會導致意外行為,具體取決於所使用的語言和數據類型。在執行整數溢出的語言中,遞減最小值將換行到該數據類型的最大值。在具有固定精度算術的語言中,減小最小值可能會導致錯誤或未定義的行為。

遞減浮點變數的工作方式與整數的工作方式相同嗎?

遞減浮點變數的工作方式與整數類似,但由於浮點精度問題,您需要謹慎。在某些情況下,由於浮點數以二進位表示的方式,遞減可能會導致小的不準確。最好使用整數變數進行遞減,以避免精度問題。

我可以使用遞減來修改字串中的字元嗎?

在大多數程式設計語言中,字串是不可變的,這意味著它們的各個字元不能直接修改。由於遞減運算符修改變量的值,因此它不能用於更改字串中的單個字元。若要修改字串,需要創建一個具有所需更改的新字串。

遞減運算子如何處理其他數據類型,如陣列?

在某些程式設計語言中,遞減運算子可能不直接適用於數位,因為它適用於標量變數。若要遞減數位元素,通常可以訪問數位索引,然後對特定元素使用遞減運算符。

遞減變數是否與將其設置為負值相同?

不可以,遞減變數會將其值減少 1,而將其設置為負值會直接為變數分配一個負數。例如,如果“x”的值為 5,則將其遞減 (x--) 將使其成為 4,但將其設置為負值 (x = -1) 會將 -1 分配給“x”。

在表達式中使用遞減的順序重要嗎?

是的,在表達式中使用遞減運算子的順序可能會影響結果。遞減前(例如,“--count”)在運算式計算之前減小值,而遞減後(例如,“count--”)在表達式計算后減小該值。當變數是較大表達式的一部分時,這種區別是相關的。

我可以在同一表達式中將遞減運算子與其他算術運算元一起使用嗎?

是的,遞減運算符可以與同一運算式中的其他算術運算元一起使用。例如,您可以將其與加法、減法、乘法或除法結合使用,以執行更複雜的計算,同時遞減變數的值。

使用遞減運算符時有哪些潛在的陷阱?

一個潛在的陷阱是無意中創造了一個無限迴圈。忘記正確更新迴圈控制變數可能會導致迴圈永不終止。此外,如果不小心處理,在基於索引的迴圈上使用遞減可能會導致訪問數位邊界之外的元素。

減少總是實現特定結果的最佳方式嗎?

雖然遞減是一項有用的操作,但它可能並不總是實現某些結果的最佳選擇。根據方案,可能有其他方法,例如使用不同的迴圈類型、條件語句或其他算術運算。

使用遞減是否會影響代碼性能?

在大多數情況下,使用遞減對代碼性能的影響可以忽略不計。現代編譯器和解釋器經過優化,可以有效地處理遞減操作。但是,首先關注代碼的可讀性和可維護性至關重要,然後在必要時考慮性能優化。

在迴圈中,遞減總是比遞增更可取嗎?

在迴圈中使用遞增還是遞減取決於具體用例。遞增在從低值開始並上升的迴圈中更為常見,而遞減對於反向反覆運算或倒計時方案很有用。選擇最適合代碼邏輯和可讀性的方法。

使用 decrement 運算子會影響代碼的可讀性嗎?

在適當的情況下使用遞減運算符可以提高代碼的可讀性,尤其是當您需要執行倒計時、反向反覆運算或基於遞減值的循環終止時。但是,與任何操作一樣,必須明智地使用它,並包含描述性變數名稱和註釋以使其清晰。

遞減和減法賦值運算子有什麼區別?

遞減專門將變數的值減少 1,而減法賦值運算子 (“-=”) 從變數中減去給定值。遞減運算子主要用於將值減小 1,而減法賦值運算子用於任意減法。

與其他算術運算相比,使用遞減對性能有何影響?

與其他基本算術運算(如加法或乘法)相比,使用遞減對性能的影響可以忽略不計。遞減是現代編譯器和解釋器可以有效優化的簡單操作。因此,與其他操作相比,遞減的選擇更多地與代碼邏輯和可讀性有關,而不是性能。

{"pageComponentDataId":"537198bf07954-401a-b47a-087e257f1d72","isAssociatedRelease":"true","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