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2013-12-05T15:37:41.093
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Several people have given you the right answer; here's an explanation of why your attempts didn't work. Why <code>A[0] && A[1] && A[2] && A[3] == A[4]</code> didn't work: The expression <code>A && B</code> will evaluate to 0 if either <code>A</code> or <code>B</code> are zero, or to 1 if both <code>A</code> and <code>B</code> are non-zero. The <code>&&</code> operator is left-associative, meaning expressions like <code>A && B && C</code> are parsed as <code>(A && B) && C</code>; IOW, <code>C</code> is AND-ed with the result of <code>A && B</code> (0 or 1). Thus, <code>A[0] && A[1] && A[2] && A[3] == A[4]</code> will only evaluate to true if all of <code>A[0]</code> through <code>A[3]</code> are non-zero and <code>A[4]</code> == 1, or any one of <code>A[0]</code> through <code>A[3]</code> are 0 and <code>A[4]</code> == 0. Also note that the <code>&&</code> operator won't evaluate the right-hand operand if the left-hand operand is 0. Why <code>(A[0]),(A[1]),(A[2]),(A[3]) == (A[4])</code> didn't work: The comma operator evaluates each expression in sequence, and the result is the value of the last expression, so only the value of <code>A[3]</code> is being compared to <code>A[4]</code>. Each of <code>A[0]</code> through <code>A[2]</code> is evaluated, but the result is discarded. Why <code>(A[0]) == (A[1]) == (A[2]) == (A[3]) == (A[4])</code> didn't work: Similar to the <code>&&</code> operator, the result of <code>A == B</code> will be 0 or 1. Also similar to the above, the <code>==</code> operator is left-associative, so <code>A == B == C</code> is parsed as <code>(A == B) == C</code>, so <code>C</code> is being compared to the result of <code>A == B</code>, which will be either 0 or 1. So the above will only evaluate to true if <code>A[0]</code> and <code>A[1]</code> are the same, and <code>A[2]</code> through <code>A[4]</code> all equal 1. Therefore, if you want to check that multiple expressions are all equivalent, you must write something like <pre><code>A == B && B == C && C == D </code></pre>
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1. POIf statement where all the conditions equal each other
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1. COBut note that the && operator guarantees that the left operand is sequenced before the right one, while the == operator gives no such guarantee. This matters when the operands contain side effects such as modifying a variable or calling a function. For example, `a++ && a++` is well-defined behavior, but `a++ == a++` is undefined behavior.
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