在shell中编写if-else语句并将输出回显到变量,可以使用以下语法: 代码语言:txt 复制 if [ condition ]; then # 如果条件为真,则执行以下命令 variable="output" else # 如果条件为假,则执行以下命令 variable="other output" fi 其中,condition是一个条件表达式,可以使用比较运算符(如-eq、-
@echooffset/p var=请输入命令: %var%if%ERRORLEVEL%==0 (echo%var% 执行成功了)ELSE(echo%var% 执行失败了!)pause%0 IF [NOT] string1==string2 command 比较变量或者字符的值是不是相等 @echooffset/p var1=输入变量1:set/p var2=输入变量2:IF%var1% == %var2% (echo变量相同)ELSEecho变量不相...
因此，我设法使用字典编写了一个货币转换器。使用if-else的缺点是，在所有的汇率中，您将忙于键入数百...
We first declare an integer variable marks inside the main() function and initialize it with the value of 28.As mentioned in code comments, we then employ an if-else statement to check if the student has passed or failed.We check the condition to see if the value of marks variable is ...
shell脚本编程-使用结构化命令(if/else)(转) 11.1 使用if-then语句 格式如下 if语句会执行if行定义的那个命令,如果该命令的退出状态码是0,则then部分的语句就会执行,其他值,则不会 1 2 3 4 ifcommand then commands fi 在要执行的命令结尾加个分号,就能在同一行使用then语句了,格式如下...
if [not] exist FileName command [else expression] If command extensions are enabled, use the following syntax: if [/i] string1 CompareOp string2 command [else expression] if cmdextversion number command [else expression] if defined variable command [else expression] Parameters not : Specifies ...
If command extensions are enabled, use the following syntax: 复制 if [/i] <String1> <CompareOp> <String2> <Command> [else <Expression>] if cmdextversion <Number> <Command> [else <Expression>] if defined <Variable> <Command> [else <Expression>] Parameters 展开表 Parameter Description...
if defined somevariable somecommand Following is an example of how the if defined statement can be used.Example@echo off SET str1 = String1 SET str2 = String2 if defined str1 echo "Variable str1 is defined" if defined str3 (echo "Variable str3 is defined") else (echo "...
However, if you try to print the value of the num variable outside the if block, you'll get an error:Go Copy package main import "fmt" func somenumber() int { return -7 } func main() { if num := somenumber(); num < 0 { fmt.Println(num, "is negative") } else if num ...
5、INED variable comma nd1 else comma nd2 存在判断举例: echo off set var=111 if defi ned var (echo var=%var%) else echo var尚未定义! set var= if defi ned var (echo var=%var%) else echo var尚未定义! pause nul 对比可知,set var= 可以取消变量,收回变量所占据的内存空间。 for语句(...