Sas 简明教程
SAS - Decision Making
决策结构要求程序员指定程序要评估或测试的一个或多个条件，以及在确定条件为 true 时要执行的语句或语句，而且在条件确定为 false 时可能还要执行其他一些语句。
Decision making structures require the programmer to specify one or more conditions to be evaluated or tested by the program, along with a statement or statements to be executed if the condition is determined to be true, and optionally, other statements to be executed if the condition is determined to be false.
以下是大多数编程语言中常见的典型决策结构的一般形式 −
Following is the general form of a typical decision making structure found in most of the programming languages −
SAS 提供以下类型的决策语句。单击以下链接查看其详细信息。
SAS provides following types of decision making statements. Click the following links to check their detail.
Sr.No. |
Statement Type & Description |
1 |
IF Statement.An if statement consists of a condition. If the condition is true then the specific data is fetched. |
2 |
IF-THEN-ELSE Statement.An if statement followed by else statement, which executes when the boolean condition is false. |
3 |
IF-THEN-ELSE-IF Statement.An if statement followed by else statement, which is again followed by another pair of IF-THEN Statement. |
4 |
IF-THEN-DELETE Statement.An if statement consists of acondition, which when true deletes the specific data from the observations. |