字符常量'a'和字符串常量"a"虽然都只有一个字符,但在内存中的情况是不同的。
'a'在内存中占一个字节,可表示为:
a
"a"在内存中占二个字节,可表示为:
a\0
3.6变量赋初值
在程序中常常需要对变量赋初值,以便使用变量。语言程序中可有多种方法为变量提供初值。本小节先介绍在作变量定义的同时给变量赋以初值的方法。这种方法称为初始化。在变量定义中赋初值的一般形式为:
类型说明符 变量1= 值1,变量2= 值2,……;
例如:
int a=3;
int b,c=5
floatx=3.2,y=3f,z=0.75
charch1='K',ch2='P'
应注意,在定义中不允许连续赋值,如a=b=c=5是不合法的。
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其他回答
npm run dev
npm运行dev任务
dev的任务需要在package.json中定义,例如
"scripts": {
"dev": "gulp"
[js压缩]uglifyjs source.js -mc -o target.min.js压缩angular.js例压缩局部变量名掉用局部变量空白符等压缩比例接近80%效率错
[user_00@localhost ~]$ uglifyjs angular.js -mc -o angular.min.js
WARN: Dropping unused function isBoolean [angular.js:416,9]
WARN: Dropping unused function makeMap [angular.js:446,9]
WARN: Dropping unused function size [angular.js:488,9]
WARN: Dropping unused function isLeafNode [angular.js:523,9]
WARN: Dropping unused function argument boundTranscludeFn [angular.js:4682,27]
WARN: Dropping unused function argument rootElement [angular.js:4681,16]
WARN: Dropping unused function argument nodeList [angular.js:4680,17]
WARN: Dropping unused function argument scope [angular.js:4679,22]
WARN: Dropping unused function nodesetLinkingFn [angular.js:4678,9]
WARN: Dropping unused function argument boundTranscludeFn [angular.js:4690,27]
WARN: Dropping unused function argument rootElement [angular.js:4689,16]
WARN: Dropping unused function argument node [angular.js:4688,13]
WARN: Dropping unused function argument scope [angular.js:4687,22]
WARN: Dropping unused function argument nodesetLinkingFn [angular.js:4686,25]
WARN: Dropping unused function directiveLinkingFn [angular.js:4685,9]
WARN: Dropping unused function stripHash [angular.js:5009,9]
WARN: Dropping unused variable NG_SWITCH [angular.js:13857,4]
WARN: Dropping unused variable fns [angular.js:1536,8]
WARN: Dropping unused variable events [angular.js:1536,13]
WARN: Dropping unused function wrongMode [angular.js:3879,13]
WARN: Dropping unused function argument cause [angular.js:4799,31]
WARN: Dropping unused function argument exception [angular.js:4799,20]
WARN: Dropping unused function argument args [angular.js:8165,28]
WARN: Dropping unused function argument args [angular.js:8231,33]
WARN: Dropping unused function argument names [angular.js:9018,32]
WARN: Dropping unused function argument name [angular.js:9030,40]
WARN: Dropping unused variable value [angular.js:9230,14]
WARN: Dropping unused function argument value [angular.js:12475,36]
[user_00@localhost ~]$ ls -lh angular.*
-rw-rw-r-- 1 user_00 user_00 479K Apr 5 01:53 angular.js
-rw-rw-r-- 1 user_00 user_00 79K May 4 16:09 angular.min.js
现我test.tar文件通tar -xvf test.tar 解压缩文件夹test现我想解压缩文件夹名称直接改123,命令哪位帮忙答