console.log("你好!")
var flag:boolean = true ;
flag = false;
var a:number = 123;
a = 12.3;
var str:string = "hello,whr";
console.log('str', str);
var arr:number[] = [1,2,3,4.5];
var arr_string:string[] = ["C++","java","python"];
var arr_list:Array<number> = [1,2,9,4,5,6];
var arr_tuple:[string,number,boolean] = ["hello",12,true];
console.log('dd', arr_tuple);
var num_0:number = 123;
var num_1:any = "str";
console.log('num_1', num_1);
num_1 = 123.34;
console.log('num_1', num_1);
var num:number;
console.log('num', num)