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  1. PO
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    <p>This is what you want.</p> <ol> <li>Declare functions outside the main method.</li> <li>Declare functions before the main method or use forward declarations</li> <li>Pass the 'value' to each function as a argument.</li> <li>Remove unnecessary variable declaration.</li> <li>Use some validation for user inputs.</li> <li>Use meaningful variable names.</li> </ol> <h1>include </h1> <pre><code>using namespace std; double C2F(double f) { return f * 9 / 5 + 32; } double K2F(double f) { return ((f - 273.15) * 1.8 + 32.0); } double N2F(double f) { return (f * 60 / 11 + 32); } int main() { char function; double value; cout &lt;&lt; "This temperature Conversion program converts other temperatures to farenheit" &lt;&lt; endl; cout &lt;&lt; "The temperature types are" &lt;&lt; endl; cout &lt;&lt; "" &lt;&lt; endl; cout &lt;&lt; "C - Celcius" &lt;&lt; endl; cout &lt;&lt; "K - Kelvin" &lt;&lt; endl; cout &lt;&lt; "N - Newton" &lt;&lt; endl; cout &lt;&lt; "X - eXit" &lt;&lt; endl; cout &lt;&lt; "" &lt;&lt; endl; cout &lt;&lt; "To use the converter you must input a value and one of the temperature types." &lt;&lt; endl; cout &lt;&lt; "For example 32 C converts 32 degrees from Celsius to Fahrenheit" &lt;&lt; endl; cin &gt;&gt; value &gt;&gt; function; function = toupper(function); while (function != 'X') { switch (function) { case 'C': cout &lt;&lt; value &lt;&lt; "C is " &lt;&lt; C2F(value) &lt;&lt; " in Farenheit" &lt;&lt; endl; break; case 'K': cout &lt;&lt; value &lt;&lt; "K is " &lt;&lt; K2F(value) &lt;&lt; " in Farenheit" &lt;&lt; endl; break; case 'N': cout &lt;&lt; value &lt;&lt; "N is " &lt;&lt; N2F(value) &lt;&lt; " in Farenheit" &lt;&lt; endl; break; default: cout &lt;&lt; "Correct choices are C, K, N, X" &lt;&lt; endl; } cout &lt;&lt; "Please enter a value and it's type to be converted" &lt;&lt; endl; cin &gt;&gt; value &gt;&gt; function; function = toupper(function); } return 0; } </code></pre>
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    1. POSimple Function C++
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    1. USNayana Adassuriya
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      1. VTUpMod
    1. COIs it possible to request the input 'value' from the user from within the function?
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      1. USHugo Ramirez
    2. COof course. I recommend you to go trough this tutorial for some basic understanding about C++ http://www.cplusplus.com/doc/tutorial/
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      1. USNayana Adassuriya
 

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