45 lines
1.1 KiB
Markdown
45 lines
1.1 KiB
Markdown
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---
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title: if else Statements
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localeTitle: 如果是其他声明
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---
## 介绍
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`if`指定的条件为**true** ， `if`语句执行语句。如果条件为**false** ，则可以使用`else`语句执行另一个语句。
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**注意：** `else`语句是可选的。
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```Go
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x := 7
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if x%2 == 0 {
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// This statement is executed if x is even
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} else {
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// This statement is executed if x is odd
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}
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```
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可以嵌套多个`if...else`语句来创建`else if`子句。
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```go
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x := 7
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if x == 2 {
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// this statement is executed if x is 2
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} else if x == 4 {
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// this statement is executed if x is 4
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} else if x == 7 {
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// this statement is executed if x is 7
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} else {
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// this statement is executed if none of the aboves is true
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}
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```
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在Go中，您可以在`if`条件之前加上语句。然后，包含的变量定义对完整的`if`块有效。
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```go
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if x := 3; x == 2 {
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// this statement is executed if x is 2
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} else if x == 3 {
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// this statement is executed if x is 3
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} else {
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// this statement is executed if none of the aboves is true
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}
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```
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