5.29. Perl goto statement

发布时间 : 2023-10-20 23:00:04 UTC      

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Perl has three forms of goto : got LABLE , goto EXPR , and goto &NAME :

Serial number

Goto Typ

1

Goto LABEL finds the statement marked LABEL and re-executes it from there.

2

The goto EXPR goto EXPR form is only a general form of goto LABEL. It expects the expression to generate a tag name and jump to that tag to execute.

3

Goto & NAME it replaces a running child process with a call to a named childprocess.

Principles, Technologies, and Methods of Geographic Information Systems  102

In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress.