CODEWITHSUNDEEP
javaloopswhile-loopoperands
user2743857
user2743857

Reputation: 81

Two condition while loop

while( first1<=last1 || first2<=last2 )

while( first1<=last1 && first2<=last2 )

I am just trying to make sure I am correct. For an "or" condition it means that it only needs one of those to be true to enter the while loop, while the "and" condition needs both to be true to enter the while loop? First time I've seen the "and" and "or" operation not in an if statement, so i am a little confused.

Upvotes: 0

Views: 412

Answers (3)

McLovin
McLovin

Reputation: 3674

They work exactly the same as in an if statement, the location does not matter.
Here are some truth tables to clarify.

a      b       a OR b   a AND b
false  false | false  | false
false  true  | true   | false
true   false | true   | false
true   true  | true   | true

Upvotes: 0

rush2sk8
rush2sk8

Reputation: 392

This is a classic example of java short circuiting.

int x = 14;
    while(x>10 && x<50)

In this statement the first part is true but for an and statement both operands must be true for it to excecute. Now it looks at the next side that is true asweell so the while loop will excecute. If x had been -11 then the first part would be false and it would not even look at the other side becasue the statement is already false. The same is with or ( || ) . Or will short circuit when the left hand side is true then it doesnt even look at the other side.

Upvotes: 0

awksp
awksp

Reputation: 11867

Yep! && and || work exactly as they do in an if statement. In fact, you can interpret the condition of a while loop as an if statement -- if the condition is true, enter the loop

Upvotes: 3

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