Thread: && , || usage?

Hello, i'd like to confirm the following:

suppose the question is: we have three int's (int a, int b, int c) and the value is true if and only if the sum of a and c is greater than b, then b is divisible by 3 without remainder.
Do both the answers below mean the same?

if (!((a + c) > b) || b % 3 == 0) {
return true;

if(a+ c>b &&  b%3==0){
return true;

The way to test whether the two expressions are equivalent (rather than just think about them) is to print their values for lots of different input values of a, b and c.

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Do you mean "the value is true if and only if if the sum of a and c is greater than b, then b is divisible by 3 without remainder"? If so, the first expression captures this meaning. The second means something like "the value is true if and only if both the sum of a and c is greater than b, and b is divisible by 3 without remainder".

Originally Posted by hemla

if (!((a + c) > b) || b % 3 == 0) {
return true;

This if-statement will return true if a + c > b is false OR b is divisible by 3 without a remainder. The only time it will not return true is if a + c > b is true and b is not divisible by 3.

Originally Posted by hemla

if(a+ c>b &&  b%3==0){
return true;

This if-statement returns true if a + c > b is true AND b is divisible by 3 without a remainder. This will return false if either a + c > b is false or b % 3 == 0 is false.

In Java, as well as other OOP languages, server-side languages (i.e. PHP) and client-side languages (i.e. JavaScript), && is the logical operator AND, while || is the logical operator OR.