Operators A binary operator combines two values to get one result: x OP y where OP is any binary operators such as +, -, *, /, ==, !=, >, &&, or even =.

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Presentation transcript:

Operators A binary operator combines two values to get one result: x OP y where OP is any binary operators such as +, -, *, /, ==, !=, >, &&, or even =. A unary operator takes one value and gives one result: OP x where OP can be +, -, &, !, ++, etc.

Arithmetic Operators + Add - Subtract * Multiply / Divide % Modulus Examples:   -2 3 * 2  6 4 / 2  2 10 % 3  1

Arithmetic Operators, Examples char c, d; int i, j; float w, x; double y, z; c = 8; d = 'R'; i = 76; w = 7.9; y = e8; j = i * i; (j gets 76  76=5776) j = i * c; (j gets 76  8=608) j = i / c; (j gets 9, fractional part dropped) j = i * d; (j gets 76  82=6232) x = i / w; (x gets 76/7.9= ) j = i / w; (j gets 9, fractional part dropped) z = w * y; (z gets 7.9   10 8 = ) This is Example 3.3.1, page 84.

Operator Precedence and Associativity How is the expression computed if there are multiple binary operators involved? For example: x OP1 y OP2 z Is it (x OP1 y ) OP2 z or x OP1 (y OP2 z)? Answer: §Operators with high precedence are acted first. §Operators of the same precedence follow the association rule (from left to right or right to left).

Precedence Operators *, /, and % have higher precedence than +, -. Thus * 4 is 5 + (3 * 4) = =17 8 % is (8 % 3) + 5 = = 7

Association Operators *, /, and % have the save precedence; operator + and - have the same precedence. They all associates from left to right. Thus is (5 - 3) + 4 = = 6 8 % 3 * 5 is (8 % 3) * 5 = 2 * 5 = 10

Assignment Operators The operators used in the form x op= y (no space between op and =) is equivalent to x = x op ( y ) where op is +, -, *, /, %, >>, <<, &, ^ or |. Examples: x += 3  x = x + 3 y *= x+z  y = y*(x+z)

Relational and Logical Operators Relational == equal != not equal > greater than >= greater than or equal < less than <= less than or equal Logical && and || or ! not

Relational Operators int x, y, z; x = 1; y = 4; z = 14; Expression value x < y + z1 (true) y == 2 * x + 30 (false) z <= x + y0 (false) z > x1 (true) x != y1 (true) The values of relational and logical expressions are 0 (for false) and 1 (for true). This is Example 3.4.2, page 89.

Logical Operators Zero (0) denotes false; any nonzero values (e.g. 1, 7, or -2) denotes true.

Logical Operators int x, y, z; x = 1; y = 4; z = 14; Expression value x <= 1 && y == 3 0 (false) x <= 1 || y == 3 1 (true) !(x > 1) 1 (true) !x > 1 0 (false) !(x<=1 || y==3) 0 (false) x >= 1 && y == 3 || z < 14 0 (false) This is Example 3.4.4, page 91

Assignment Operators The equal sign = is also considered an operator and the construct x = y is also an expression. Every expression has a value. The value of x = y is the value assigned to the variable x. A semicolon turns an expression into a statement. E.g., x = y;

Assignment Operators Associate from Right to Left The expression x = y = z means x = (y = z) If z is 10, the value 10 will be assigned to y and in turn assigned to x.

Reading/Home Working Read Chapter 3, page 83 to 94. Work on Problems –Section 3.3, page 88, exercise 1, 3, 5. –Section 3.4, page 94, exercise 1. Check your answers in the back of the textbook. Do not hand in.