Chapter 1, Problem 5R

Program Plan Intro

Operator precedence in java:

• The C++ has well-defined set of rules that specifies the order in which the operators in an expression gets evaluated.
• For example, in C++ it is defined that the multiplication and division has higher precedence than subtraction or addition.
• The operations multiplication, division and modulus have same precedence.
• The operations addition, subtraction and modulus have same precedence.
• The operators *, / and % are higher precedence than operators + and -.
• In C++, the parenthesis gets more priority than any other operator.
• Example for evaluation of expression with parenthesis:
• Consider the below expression,

4*(2*(3+2))

• In the above expression, the innermost parenthesis gets evaluated first. That is (3+2) is evaluated and it results 5. Then this 5 is multiplied using 2 and the result is 10. Then 10 are multiplied with 4 and the result is 40.
• Example for evaluation of expression without parenthesis:
• Consider the below expression,

4*2*3+2

• If there is no parenthesis, the result of this expression will be 26. This is found according to the operator precedence. The operator (*) has higher precedence than “+”.
• If an expression contain more than one operator with same precedence, their associatively defines the order of evaluation. Then the evaluation does either using left-to-right or right-to-left order.