What does if ( a & 1) means where a is an int?

Question

Given this code

int arry[2]; //equal to some values

if (arry[0] & 1) //what does this mean?
{
    // do something
}

Answer 1

& is the bitwise AND operator. Bitwise AND operation performs the logical AND operation for the corresponding bits of each operand. In the case of a & 1 , the left hand operand is the integer a , and the right hand operand is the integer 1 .

if keyword is syntax for the if-statement. The simplified grammar of the statement is:

if ( condition ) statement-true

The statement-true statement is executed only if the condition expression is true. Here, the type of the condition expression is an integer type. In this case, the condition is true if the value of the result of the bitwise operation is not zero.