C++ dart operators

// first individual use

void main() {
  int x = 5;
  int y = 2;
  int z = x + y; // collection operator
  int z = x - y; // extraction operator
  int z = x * y; // impact operator
  int z = x / y; // divide operator
  
}

// seconds if else operators

void main() {
   int x = 2;
   int y = 5;
   if(x == y) {} // equality operator
   if(x < y) {} // less than sign operator
   if(x > y) {} // greater operator
   if(x <= y) {} // less than sign or equality operator
   if(x >= y) {} // greater or equality operator
}

// I guess that's enough for now, good coding <3

Dart supports the following types of operators.

1.Arithmetic Operators
2.Assignment Operators
3.Relational Operators
4.Type test Operators
5.Logical Operators
6.Bitwise Operator
7.Conditional Operators
8.Casecade notation(..) Operators


1.Dart Arithmetic Operators

Example -
void main(){  
  print("Example of Assignment operators");  
  var n1 = 10;  
  var n2 = 5;  
    
  print("n1+n2 = ${n1+n2}");  
  print("n1-n2 = ${n1-n2}");  
  print("n1*n2 = ${n1*n2}");  
  print("n1/=n2 = ${n1/n2}");   
  print("n1%n2 = ${n1%n2}");     
} 

Output:
Example of Arithmetic operators 
n1+n2 = 15 
n1-n2 = 5 
n1*n2 = 50 
n1/=n2 = 2 
n1%n2 = 0

2. Unary Operators (post and pre)

Example -
void main() {   
   var x = 30;   
   print(x++);                  //The postfix value  
     
var y = 25;  
print(++y);                 //The prefix value,  
         
var z = 10;  
print(--z);                  //The prefix value  
  
var u = 12;                                           
   print(u--);     //The postfix value  
}          
   
Output:
30
26
9
12

3. Assignment Operator

Example -
void main(){  
 print("Example of Assignment operators");  
    
  var n1 = 10;  
  var n2 = 5;  
    
  n1+=n2;  
  print("n1+=n2 = ${n1}");  
    
  n1-=n2;  
  print("n1-=n2 = ${n1}");  
    
  n1*=n2;  
  print("n1*=n2 = ${n1}");  
    
  n1~/=n2;  
  print("n1~/=n2 = ${n1}");  
  n1%=n2;  
  print("n1%=n2 = ${n1}");    
}  

Output:
Example of Assignment operators 
n1+=n2 = 15 
n1-=n2 = 10 
n1*=n2 = 50 
n1~/=n2 = 10 
n1%=n2 = 0 

4. Relational Operator

Example -
void main() {   
var a = 30;  
var b = 20;  
  
print("The example of Relational Operator");  
  
var res = a>b;  
print("a is greater than b: "+res. toString());  // We will learn the toString in next tutorial  
  
var res0 = a<b;  
print("a is less than b: "+res0. toString());  
  
var res1 = a>=b;  
print("a is greater than or equal to b: "+res1. toString());  
  
var res2 = a<=b;  
print("a is less than and equal to b: "+res2. toString());  
  
var res3 = a!= b;  
print("a is not equal to  b: "+res3. toString());  
  
var res4 = a==b;  
print("a is  equal to  b: "+res4. toString());  
}  

Output:
The example of Relational Operator
a is greater than b: true
a is less than b: false
a is greater than or equal to b: true
a is less than and equal to b: false
a is not equal to  b: true
a is  equal to  b: false

5. Type Test Operators

Example:
void main()  
{  
  var num = 10;  
  var name = "JavaTpoint";  
  print(num is int);    
  print(name is! String );  
} 

Output:
true
false

6. Logical Operators

Example:
void main(){  
  bool bool_val1 = true, bool_val2 = false;   
  print("Example of the logical operators");  
    
  var val1 = bool_val1 && bool_val2;  
  print(val1);  
    
  var val2 = bool_val1 || bool_val2;  
  print(val2);  
    
  var val3 = !(bool_val1 || bool_val2);  
  print(val3);   
}  

Output:
false 
true 
false

7. Bitwise Operators

Example -
void main(){  
  print("Example of Bitwise operators");  
    
  var a  = 25;  
  var b = 20;  
  var c = 0;  
    
  // Bitwise AND Operator  
  print("a & b = ${a&b}");  
    
  // Bitwise OR Operator  
  print("a | b = ${a|b}");  
    
  // Bitwise XOR  
  print("a ^ b = ${a^b}");  
    
  // Complement Operator  
  print("~a = ${(~a)}");  
    
  // Binary left shift Operator  
  c = a <<2;  
  print("c<<1= ${c}");  
    
  // Binary right shift Operator  
  c = a >>2;  
  print("c>>1= ${c}");  
}  

Output:
a & b = 16
 a | b = 29
 a ^ b = 13
 ~a = 4294967270
 c<<1= 100
 c>>1= 6

8. Conditional Operators (?:)

Example -
void main() {   
   var x = null;   
   var y = 20;   
   var val = x ?? y;   
   print(val);   
}  

Output:
20

var a = 10 
var result = ( a>5 || a<10)

String? foo = null;

print(foo ?? " its empty");//output: ' its empty'

foo = "foo";

print(foo ?? " its empty");//output: "foo"

void main() {
  
  dynamic variable = "hello";
  
  if(variable is String) {
    print("is a String");
  } else {
    print("is not String");
  }
 
  if(variable is int) {
    print("is a int");
  } else {
    print("is not int");
  }
    
}

void main() {
  Person()
    ..name = "John"
    ..age = 30
    ..sex = "Male"
    ..describeMyself();
}

class Person {
  String? name;
  int? age;
  String? sex;

  Person({this.name, this.age, this.sex});

  void describeMyself() {
    print('Hello my name is $name, I am $age years old');
  }
}

String? foo = null;

print(foo ?? " its empty");//output: ' its empty'

foo = "foo";

print(foo ?? " its empty");//output: "foo"

??

Called also null operator. This operator returns expression on its left, except if it is null, and if so, it returns right expression:

void main() {
  print(0 ?? 1);  // <- 0
  print(1 ?? null);  // <- 1
  print(null ?? null); // <- null
  print(null ?? null ?? 2); // <- 2
}