第三节 运算符和表达式.docVIP

Expressions An expression consists of one or more operands and operation characters. An expression can be written in several lines.Example: a++; b = 10; x = (y*z)/w; Note: An expression that ends with a semicolon is an operator. Arithmetical operations Sum of values i = j + 2; Difference of values i = j - 3; Changing the operation sign x = — x; Product of values z = 3 * x; Division quotient i = j / 5; Division remainder minutes = time % 60; Adding 1 to the variable value i++; Subtracting 1 from the variable value k-—; The operations of adding/subtracting 1 cannot be implemented in expressions.Example: int a=3; a++; // valid expression int b=(a++)*3; // invalid expression The operation of assignment Note: The value of the expression that includes this operation is the value of the left operand following the bind character. Assigning the y value to the x variable y = x; Adding x to the y variable y += x; Subtracting x from the y variable y -= x; Multiplying the y variable by x y *= x; Dividing the y variable by x y /= x; Module x value of y y %= x; Logical shift of y representation to the right by x bit y = x; Logical shift of y representation to the left by x bit y = x; Bitwise operation AND y = x; Bitwise operation OR y |= x; Bitwise operation exclusive OR y ^= x; Note: There can be only one operation of assignment in the expression. You can implement bitwise operations with integer numbers only. The logical shift operation uses values of x less than 5 binary digits. The greater digits are rejected, so the s