一、Numbers (数值类型)
1、int 类型
var number1 = 12345;
int number = 12345;
2、double 类型
var number1 = 20.00;
print(number1);
double number2 = 15.5;
print(number2);
二、Strings (字符串)
1、声明
var str1 = "我是一个字符串";
print(str1);
String str2 = "我是一个字符串";
print(str2);
2、Strings 转 Numbers 转换
// Strings 转 int
var str1 = "15";
int number1 = int.parse(str1);
print(number1);
// Strings 转 double
String str2 = "20.00";
double number2 = double.parse(str2);
print(number2);
3、 Numbers转Strings
// int 转 Strings
var number1 = 20;
String str1 = number1.toString();
print(str1);
// double 转 Strings
double number2 = 15.5;
String str2 = number2.toString();
print(str2);
三、Booleans (布尔)
var success1 = true;
bool success2 = false;