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C Else If


else if 语句

使用 else if 语句来指定一个新的条件,如果第一个条件是 false

语法

if (condition1) {
  // 如果 condition1 为真,则执行的代码块
} else if (condition2) {
  // 如果 condition1 为假且 condition2 为真,则执行的代码块
} else {
  // 如果 condition1 为假且 condition2 为假,则执行的代码块
}

示例

int time = 22;
if (time < 10) {
  printf("早上好。");
} else if (time < 20) {
  printf("下午好。");
} else {
  printf("晚上好。");
}
// 输出 "晚上好。"
尝试一下 »

示例解释

在上面的示例中,time (22) 大于 10,所以 **第一个条件** 是 falseelse if 语句中的下一个条件也是 false,所以我们继续执行 else 条件,因为 **condition1** 和 **condition2** 都是 false - 并打印到屏幕上 "晚上好"。

但是,如果 time 是 14,我们的程序将打印 "下午好"。



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