#operator precedence

[codehunger]

Operator in c++ and Operator precedence

Operator in c++ and Operator precedence

In this article we will learn about operator in c++ and it’s precedence. so, let’s starts with the operator What is Operator in C++ programming? An operator in a C++ programming language is a symbol that tells the compiler or interpreter to perform the specific mathematical, relational, or logical operations and produce the final result. Types of Operator Arithmetic operatorsAssignment…

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[myarshan]

Operator Precedence and Associativity

In C language the precedence of operators plays an important role in evaluating an expression. If it is clear which operator is to be evaluated first it makes the expressions easily understandable.

For example ,

Int  (*a)[13]  a is a pointer to an array of thirteen integers(because here the bracket is given higher precedence).

Int   *a[13]    a is collection of 13 pointers that point to…

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[facingissuesonit]

Java : Assignment Operators

Java : Assignment Operators

Assignment Operator also called as op= operators and it’s use to reduce the expression size.

Following is the list of complete op= operators

+= -= *= /= %= <>= >>>= &= |= ^=

For Example : count +=2 has the will return the same result as expression statement : count = count + 2 ;

public class TestClass { public static void main(String[] arg) { int count1 = 5 , count2 = 5; //Calculation with…

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[cali-programming]

Operators

Assignments: =

Equality: ==

Strict equality: ===

Arithmetic

+

-

*

/

Operator precedence: PEMDAS

Shorthand operators:

+=

-=

*=

/= e.g. total = total + 10 is the same as total += 10

increment

a = a + 1

a += 1

a++

decrement

a = a - 1

a -= 1

a--

[axel669]

Operator Precedence

So I found an error in some js code today that I hadn't really expected.

Some background: the javascript logical OR operator ( || ) is pretty awesome. Because js evaluates a bunch of things as false-equivalent, like the empty string, 0, empty array, etc., rather than returning a bool true or false, it returns the last expression evaluated and still keeps the c++ feature of stopping when it hits a false (or false equivalent).

Examples:

true || false // false true || 0 // 0 25 || -1 // -1 !true || 0 // false 0 || true // 0

Now, I like to use this to make default values for object properties like this:

options.eval=options.eval || true;

What i forgot however, is that despite this awesome functionality, it's still has the same precedence as the logical OR (makes sense), which is below other operators, like the equality operator for instance.

Took 15 minutes to realize this, and once I did, my code suddenly made sense.

The code:

index||0==0 // returns either index or true, so always equates to true in an if statement. (index||0)==0 // the way it should have been done, to check that index is not defined OR equal to 0