void main() { var num = 5; var factorial = 1; for( var i = num ; i >= 1; i-- ) { factorial *= i ;

// 逻辑运算符示例 void main() { var a = 10; var b = 12; var res = (a>b)||(b<10); print(res);

void main() { var a = 12; var b = 3; a+=b; print("a+=b : ${a}"); a = 12; b = 13; a-=b; print("a-=b : ${a}");

// Dart语言类型测试运算符!is void main() { doublen = 2.20; var num = n is! int; print(num); }

// Dart语言类型测试运算符is void main() { int n = 2; print(n is int); //print(n is string); }

void main() { var num1 = 5; var num2 = 9; var res = num1>num2; print('num1 greater than num2 ::' +res.toString());

void main() { var num1 = 101; var num2 = 2; var res = 0; res = num1+num2; print("Addition: ${res}");

// Dart语言const关键字 void main() { final v1 = 12; const v2 = 13; const v3 = 14; v2 = 12; }

// Dart语言final关键字 void main() { final val1 = 1202; final val2 = 1203; print(val1); print(val2);

// Dart语言dynamic关键字 void main() { dynamic x = "yiibai.com"; print(x); }

class TestClass { void disp() { print("Hello World"); } } void main() { TestClass c = new TestClass();

void main() { double n1 = 12.023; double n2 = 12.89; var value = n1.round(); print( value ); value = n2.round();

void main() { var a = 10; var b = 17; print(a.remainder(2)); print(b.remainder(2)); }

void main() { var a = 2.4; print(a.compareTo(12)); print(a.compareTo(2.4)); print(a.compareTo(0)); }

// Dart语言Ceil方法 void main() { var a = 2.4; print("The ceiling value of 2.4 = ${a.ceil()}");

void main() { int posNum = 10; int negNum = -12; int valZero = 0; print(posNum.sign); print(negNum.sign);

// Dart语言解析 - parse void main() { print(num.parse('12')); print(num.parse('10.91'));

void main() { int num1 = 10; // declare an integer double num2 = 10.50; // declare a double value print(num1);

void main() { var grade = "A"; switch(grade) { case "A": {print("Excellent"); }

void main() { var num = 2; if(num > 0) { print("${num} is positive"); } else if(num < 0) {

void main() { var num = 12; if (num % 2==0) { print("Even"); } else { print("Odd");

// Dart语言if语句 void main() { varnum=5; if (num>0) { print("number is positive"); }

void main() { outerloop: // This is the label name for (var i = 0; i < 3; i++) { print("Outerloop:${i}");

void main() { outerloop: // This is the label name for (var i = 0; i < 5; i++) { print("Innerloop: ${i}");

void main() { var num = 0; var count = 0; for(num = 0;num<=20;num++) { if (num % 2==0) { continue;

// Dart语言break语句 void main() { var i = 1; while(i<=10) { if (i % 5 == 0) { print("The first multiple of 5between 1 and 10 is : ${i}");

// Dart语言do...while循环 void main() { var n = 10; do { print(n); n--; } while(n>=0); }

void main() { var num = 5; var factorial = 1; while(num >=1) { factorial = factorial * num; num--;

void main() { for(var temp, i = 0, j = 1; j<30; temp = i, i = j, j = i + temp) { print('${j}');

void main() { var str = 'abc'; if(str) { print('String is not empty'); } else { print('Empty String');