In Listing 24, the procedureproc is coded to return an OUT parameter value, which is denoted by the parameter marker (?), and was not coded to accept an input value.
在清单24中，过程被编码为返回一个OUT参数值，使用参数标记(？)表示，并且不能接受输入值。
2
A group of SAS procedure statements is called a proc step.