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If-Else语句

如果某种条件为,就执行if 部分的代码。 如果条件为, 就执行else部分的代码。

语法#

源代码 (UnigineScript)
if(expression) { 
	// code_if_true
} else { 
	// code_if_false 
}

部分#

  • expression为条件。

示例#

源代码 (UnigineScript)
int a = 2;
int b = 5;

if(a > b) {
	log.message("true\n");
} else {
	log.message("false\n");
}

// 输出:假

可分别使用ifelse

源代码 (UnigineScript)
int a=2;
if(a == 2) log.message("a is equal to 2\n");

// 结果为: a is equal to 2

注意
请注意如果条件处为一个复杂的布尔型表达式,会按照从左到右的方式对表达式进行求值(短路求值):
源代码 (UnigineScript)
int func(int a) {
	return a;
}

// 仅调用一次(第一次)func()
if(func(0) && func(1)) log.message("true\n");
// 两次调用func()
if(func(1) && func(1)) log.message("true\n");
// 仅调用一次(第一次)func()
if(func(1) || func(1)) log.message("true\n");
// 两次调用func()
if(func(0) || func(1)) log.message("true\n");
最新更新: 2017-07-03