Data structures and algorithms in C++
Data structures and algorithms in C++
2nd Edition
ISBN: 9780470460443
Author: Goodrich
Publisher: WILEY
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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.

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