FLEX程序基本结构--分支结构程序设计

1.if语句

格式:if(表达式) 语句

var a:int=5,b:int=5,max:int;
max=a;
if(max<b) max=b;
trace(max.toString());
2.if.....else语句

格式: if(表达式)

语句1;

else
语句2;

var a:int=5,b:int=10;
if(a>b)
trace("max:"+a.toString());
else
printf("max:"+b.toString());
3.if...else...if语句

格式: if(表达式1)

语句1;

else if(表达式2)
语句2;

else if(表达式m)
语句m;

else

语句n;

4.if语句的嵌套

格式: if(表达式)

if语句;

else

if语句;

5.switch语句

格式: switch(表达式)

{

case 常量表达式1:语句1; break;

case 常量表达式2:语句2; break;

.....

case 常量表达式n:语句n; break;

default: 语句n+1; break;

}

var a:int=3;
switch (a)
{
case 1:
trace("Monday\n");
break;
case 2:
trace("Tuesday\n");
break;
case 3:
trace("Wednesday\n");
break;
case 4:
trace("Thursday\n");
break;
case 5:
trace("Friday\n");
break;
case 6:
trace("Saturday\n");
break;
case 7:
trace("Sunday\n");
break;
default:
trace("error\n");
break;
}