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    <p>Lots of things are wrong with your code, but there is a single root cause to this - a misunderstanding of how the <code>return</code> statement works.</p> <p>You have a function with multiple <code>return</code> statements. It appears that you think that all of these statements would execute; that assumption is incorrect. Only the first <code>return</code> statement reached in a function is executed; the remaining ones are ignored.</p> <p>Moreover, you appear to imply that <code>return</code> statement would influence variables in the caller automatically; it wouldn't. In order to modify a variable in the caller, the caller itself needs to assign the returned value.</p> <p>If you need your function to return multiple values, you need to change the approach: it should take multiple arguments by reference, and modify them, like this:</p> <pre><code>void Calculation(long double x, long double y, long double &amp;sum, long double &amp;difference, long double &amp;product, long double &amp;quotient) { sum = x + y; difference = x - y; product = x * y; quotient = x / y; } </code></pre> <p>You also need to change the prototype declaration of <code>Calculation</code>, like this:</p> <pre><code>void Calculation(long double x, long double y, long double &amp;sum, long double &amp;difference, long double &amp;product, long double &amp;quotient); </code></pre> <p>Call <code>Calculation</code> like this:</p> <pre><code>Calculation(a, b, sum, difference, product, quotient); </code></pre> <p>This will solve your compilation issue, and the code will run correctly.</p>
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    1. COAh yes, thanks so much, working perfectly now.
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