優先級別為1的優先級，優先級別為10的優先級別。
分支結構之簡單if語句
C語言中的分支結構語句中的if條件語句。
簡單if語句的基本結構如下：
if（表達式）
{
執行代碼塊;
}
其語義是：如果表達式的值為真，則執行其后的語句，否則不執行該語句。
注意：if（）后面沒有分號，直接寫{}分支結構之簡單if-else語句
簡單的if-else語句的基本結構：
語義是： 如果表達式的值為真，則執行代碼塊1，否則執行代碼塊2。
注意：
if（）后面沒有分號，直接寫{}，else后面也沒有分號，直接寫{}
分支結構之多重if-else語句
C語言中多重if-else語句，其結構如下：
語義是：依次判斷表達式的值，當出現某個值為真時，則執行對應代碼塊，否則執行代碼塊n。
注意：當某一條件為真的時候，則不會向下執行該分支結構的其他語句。
分支結構之嵌套if-else語句
C語言中嵌套if-else語句。嵌套if-else語句的意思，就是在if-else語句中，再寫if-else語句。其一般形式為：
循環結構之while循環
反復不停的執行某個動作就是江湖人稱的循環 。
C語言中有三種循環結構，先看一下C語言while循環的結構
其中表達式表示循環條件，執行代碼塊為循環體。
while語句的語義是：計算表達式的值，當值為真（非0）時， 執行循環體代碼塊。
while語句中的表達式一般是關系表達或邏輯表達式，當表達式的值為假時不執行循環體，反之則循環體一直執行。
一定要記著在循環體中改變循環變量的值，否則會出現死循環（無休止的執行）。
循環體如果包括有一個以上的語句，則必須用{}括起來，組成復合語句。
循環結構之do-while循環
C語言中的do-while循環，一般形式如下：
do-while循環語句的語義是：
它先執行循環中的執行代碼塊，然后再判斷while中表達式是否為真，如果為真則繼續循環；如果為假，則終止循環。因此，do-while循環至少要執行一次循環語句。
注意：mtianyan： 使用do-while結構語句時，while括號后必須有分號。
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