惯性聚合 高效追踪和阅读你感兴趣的博客、新闻、科技资讯
阅读原文 在惯性聚合中打开

推荐订阅源

酷 壳 – CoolShell
酷 壳 – CoolShell
H
Hacker News: Front Page
P
Palo Alto Networks Blog
T
ThreatConnect
Apple Machine Learning Research
Apple Machine Learning Research
博客园_首页
T
True Tiger Recordings
P
Privacy & Cybersecurity Law Blog
B
Blog
IT之家
IT之家
Last Week in AI
Last Week in AI
F
Full Disclosure
Hacker News: Ask HN
Hacker News: Ask HN
C
Comments on: Blog
Microsoft Azure Blog
Microsoft Azure Blog
C
Cybersecurity and Infrastructure Security Agency CISA
Microsoft Security Blog
Microsoft Security Blog
博客园 - 【当耐特】
N
News and Events Feed by Topic
NISL@THU
NISL@THU
腾讯CDC
雷峰网
雷峰网
Security Latest
Security Latest
李成银的技术随笔
M
Microsoft Research Blog - Microsoft Research
L
LangChain Blog
L
Lohrmann on Cybersecurity
cs.CL updates on arXiv.org
cs.CL updates on arXiv.org
C
Check Point Blog
Y
Y Combinator Blog
Recent Announcements
Recent Announcements
博客园 - Franky
N
News | PayPal Newsroom
V
V2EX
A
About on SuperTechFans
The Register - Security
The Register - Security
月光博客
月光博客
奇客Solidot–传递最新科技情报
奇客Solidot–传递最新科技情报
Google Online Security Blog
Google Online Security Blog
MyScale Blog
MyScale Blog
Cisco Talos Blog
Cisco Talos Blog
Vercel News
Vercel News
WordPress大学
WordPress大学
C
Cyber Attacks, Cyber Crime and Cyber Security
The Hacker News
The Hacker News
IntelliJ IDEA : IntelliJ IDEA – the Leading IDE for Professional Development in Java and Kotlin | The JetBrains Blog
IntelliJ IDEA : IntelliJ IDEA – the Leading IDE for Professional Development in Java and Kotlin | The JetBrains Blog
爱范儿
爱范儿
A
Arctic Wolf
L
LINUX DO - 最新话题
freeCodeCamp Programming Tutorials: Python, JavaScript, Git & More

博客园 - Goodspeed

几种常见的函数 Caesar cipher 遗传算法之背包问题 Transport scheme NOT recognized: [stomp] error running git Canvas 旋转的图片 canvas时钟 火箭起飞 让图标转起来 Tomcat启动脚本 Task中的异常处理 Parallel的陷阱 用Task代替TheadPool 使用ThreadPool代替Thread 正确停止线程 线程同步中使用信号量AutoResetEvent 异步和多线程的区别 C#和.NET Framework的关系 为什么泛型不支持协变性?
可空值类型与值类型这间的转换
Goodspeed · 2014-06-29 · via 博客园 - Goodspeed

可空值类型与值类型这间的转换

int s = 5;
int? s_null;
long t;
long? t_null;

t = s; //隐式转换 S -> T
s = (int)t; //显示转换 T -> S

s_null = s; //隐式转换 S -> S?
s = (int)s_null; //显示转换 S? -> T

t_null = s_null; //隐式转换 S? -> T?
s_null = (int?)t_null; //显示转换 T? -> S?

t_null = s; //隐式转换 S -> T?
s = (int)t_null; //显示转换 T? -> S

posted on 2014-06-29 23:21  Goodspeed  阅读(948)  评论(0)    收藏  举报