[ Team LiB ] 3 Operators and Assignments
[ Team LiB ] 3 Operators and Assignments 3.1 (a) A value of type char can be assigned to a variable of type int. An implicit widening conversion will convert the value to an int. 3.2 (d) An assignment statement is an expression statement. The value of the expression statement is the value of the expression on the right hand side. Since the assignment operator is right associative, the statement a = b = c = 20 is evaluated as follows: (a = (b = (c = 20))). This results in the value 20 being assigned to variable c, then the same value being assigned to variable b and finally to variable a. The program will compile correctly and display 20 when run. 3.3 (c) Strings are objects. The variables a, b, and c are references that can denote such objects. Assigning to a reference only changes the reference value. It does not create a copy of the source object or change the object denoted by the old reference value in the destination reference. In other words, assignment to references only affects which object the destination reference denotes. The reference value of the “cat” object is first assigned to variable a, then to variable b, and later to variable c. The program prints the string denoted by the variable c, which is “cat”. 3.4 (a), (d), and (e) A binary expression with any floating-point operand will be evaluated using floating-point arithmetic. Expressions such as 2/3, where both operands are integers, will use integer arithmetic and evaluate to an integer value. 3.5 (b) The / operator has higher precedence than the + operator. This means that the expression is evaluated as ((1/2) + (3/2) + 0.1). The associativity of the binary operators is from left to right, giving (((1/2) + (3/2)) + 0.1). Integer division results in ((0 + 1) + 0.1) which evaluates to 1.1. Page 595
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