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DOS学习入门 & 精彩文章（教学室） » Problems with PING

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Floor16　hxmupdata	Posted 2007-03-12 07:02
初级用户　Posts 39　Credits 76
For count-1, if count=%count%-1, then it is 10-1 1: What is the difference between global and local for the environment variables defined by set? 2: Can the environment variable string contain any symbols? set %count%=count-1 is set 10=count-1 Here, is 10 a variable? The result of echo %10% is echo 0. I don't understand 0 here..... Note: Display, set, or delete environment variables. If there are no parameters, the set command will display the current environment settings. Syntax set ] ] string] Parameters /a Set string to an evaluable numeric expression. /p Set the value of variable to an input line. variable Specifies the variable to be set or modified. string Specifies the string to be associated with the specified variable. /? Displays help at the command prompt.

Floor17　hxmupdata	Posted 2007-03-12 07:18
初级用户　Posts 39　Credits 76
10 is a variable but %10% is ambiguous... So how to improve it???? Can the variable defined by set contain an = sign? How to do it??

Floor18　hxmupdata	Posted 2007-03-12 07:19
初级用户　Posts 39　Credits 76
What are the points to pay attention to when using the %???????????????

Floor19　bjsh	Posted 2007-03-16 00:25
银牌会员　Posts 621　Credits 2,000

Floor20　lxmxn	Posted 2007-03-16 00:38
版主　Posts 4,938　Credits 11,386
Re hxmupdata: 　　Regarding the usage of set: If set is used without the /a parameter, it means direct assignment, that is, the value after the = sign is directly assigned to the variable before the = sign. If you want to use set for simple arithmetic operations, you must add the /a parameter because the /a parameter specifies that set is for arithmetic operations. For example, set a=1+7, then the value of variable a is "1+7". Adding the /a parameter can calculate the arithmetic expression after the = sign. For example, set /a a=1+7, then the value of variable a is 8. If you want to reference this variable, you need to enclose the variable a with %, for example, echo %a%, so that the value of variable a can be displayed. 　　In addition, there can be "=" signs in variables. For example, set str=a=b=c, then the result of echo %str% is "a=b=c".

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