Conditional statements require developers to specify one or more conditions and test whether the condition is
true
to decide whether to execute thespecified statement, and if the
false
condition is executing another statement.
The following figure shows the structure of conditional statements in a program language:
Go
language provides the following conditional judgment statements:
Statement | Description |
|---|---|
If statement | If statement? Consists of a Boolean expression followed by one or more statements. |
If…else statement | If statement? You can then use the optional? else statement, where the expression in the else statement executes when the Boolean expression is false. |
If nested statement | You can do it in if? Or else if? Embed one or more if in the statement. Or else if? Statement. |
Switch statement | Switch? Statement is used to perform different actions based on different conditions. |
Select statement | Select? The statement is similar to? switch? Statement, but select randomly executes a runnable case. If there is no case to run, it will block until case is available. Note:
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.
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