scala 运算符

scala 运算符

Scala 含有丰富的内置运算符，包括以下几种类型：

算术运算符
关系运算符
逻辑运算符
位运算符
赋值运算符

算术运算符：

object ArithmeticOperator {
  def main(args: Array[String]) {
    var a = 10;
    var b = 20;
    var c = 25;
    var d = 25;
    println("a + b = " + (a + b) );
    println("a - b = " + (a - b) );
    println("a * b = " + (a * b) );
    println("b / a = " + (b / a) );
    println("b % a = " + (b % a) );
    println("c % a = " + (c % a) );

  }
}

关系运算符：

object RelationalOperator {
  def main(args: Array[String]) {
    var a = 10;
    var b = 20;
    println("a == b = " + (a == b) );
    println("a != b = " + (a != b) );
    println("a > b = " + (a > b) );
    println("a < b = " + (a < b) );
    println("b >= a = " + (b >= a) );
    println("b <= a = " + (b <= a) );
  }
}

逻辑运算符：

object LogicalOperators {
  def main(args: Array[String]) {
    var a = true;
    var b = false;

    println("a && b = " + (a&&b) );

    println("a || b = " + (a||b) );

    println("!(a && b) = " + !(a && b) );
  }
}

位运算符：
如果指定 A = 60; 及 B = 13; 两个变量对应的二进制为：
A = 0011 1100
B = 0000 1101

代码：

object BitOperator {
  def main(args: Array[String]) {
    var a = 60;           
    var b = 13;           
    var c = 0;

    // 位运算符用来对二进制位进行 *** 作，~,&,|,^ 分别为取反，按位与，按位或，按位异或运算
    c = a & b;            
    println("a & b = " + c );

    c = a | b;            
    println("a | b = " + c );

    c = a ^ b;            
    println("a ^ b = " + c );

    c = ~a;               
    println("~a = " + c );

    c = a << 2;           
    println("a << 2 = " + c );

    c = a >> 2;           
    println("a >> 2  = " + c );

    c = a >>> 2;          
    println("a >>> 2 = " + c );
  }
}

赋值运算符：

代码：

object AssignmentOperator {
  def main(args: Array[String]) {
    var a = 10;
    var b = 20;
    var c = 0;

    c = a + b;
    println("c = a + b  = " + c );

    c += a ;
    println("c += a  = " + c );

    c -= a ;
    println("c -= a = " + c );

    c *= a ;
    println("c *= a = " + c );

    a = 10;
    c = 15;
    c /= a ;
    println("c /= a  = " + c );

    a = 10;
    c = 15;
    c %= a ;
    println("c %= a  = " + c );

    c <<= 2 ;
    println("c <<= 2  = " + c );

    c >>= 2 ;
    println("c >>= 2  = " + c );

    c >>= a ;
    println("c >>= a  = " + c );

    c &= a ;
    println("c &= 2  = " + c );

    c ^= a ;
    println("c ^= a  = " + c );

    c |= a ;
    println("c |= a  = " + c );
  }
}