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    <p>We're not going to do your homework, but let me add some hints on how to proceed. We assume that we're going to compare <em>a</em> and <em>b</em>.</p> <ol> <li>As <a href="https://stackoverflow.com/questions/1741010/c-program-to-compare-integers-without-using-logical-operators/1741031#1741031">Carl states</a>, you may want to look at the difference <em>d = a - b</em>. <ul> <li>Observation: <em>d</em> can be negative, zero or positive.</li> <li>Question: which value of <em>d</em> corresponds to which (in)equality of <em>a</em> and <em>b</em>?</li> </ul></li> <li>Once you have calculated <em>d</em> and know how to interpret it, you have to find ways to inspect it without using logical operators. <ul> <li>Observation: obvious candidates are the <a href="http://www.cprogramming.com/tutorial/bitwise_operators.html" rel="nofollow noreferrer">bitwise operators</a>.</li> <li>Question: but how do computers (usually) store integers?</li> <li>Hint: have a look at <a href="http://en.wikipedia.org/wiki/Two%27s_complement" rel="nofollow noreferrer">two's complement</a>.</li> <li>Question: how can you tell the difference between a negative and a non-negative number?</li> </ul></li> <li>Now you have all information needed to answer the question. <ul> <li>Hint: you <em>are</em>, of course, allowed to use <code>if</code> and <code>else</code> statements.</li> <li>Bonus hint: you may want to use <code>INT_MIN</code> from <code>limits.h</code>.</li> </ul></li> </ol> <p><strong>Edit:</strong> this answer, and most other answers here assume that the OP is not allowed to use <a href="http://en.wikipedia.org/wiki/Operators_in_C_and_C%2B%2B#Logical_operators" rel="nofollow noreferrer"><em>logical</em></a> and <a href="http://en.wikipedia.org/wiki/Operators_in_C_and_C%2B%2B#Comparison_operators.2FRelational_operators" rel="nofollow noreferrer"><em>relational</em></a> (<em>comparison</em>) operators. However, the OP only explicitly mentions that logical operators are disallowed. I think the main reason for this misunderstanding is the fact that the problem is trivial to solve using comparison operators.</p>
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