Dart数据类型– Numbers (数值类型) 、Strings (字符串)、Booleans (布尔)

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;