Write C a program that uses a function show call by value mechanism.

C Programming Language Function in C Language (Article) Function in C Language (Program)

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Program:

<span class="com">#include</span><span class="pln"> </span><span class="str">&lt;stdio.h&gt;</span><span class="pln">

</span><span class="kwd">int</span><span class="pln"> mul_by_10</span><span class="pun">(</span><span class="kwd">int</span><span class="pln"> num</span><span class="pun">);</span><span class="pln"> </span><span class="com">/* function prototype */</span><span class="pln">

</span><span class="kwd">int</span><span class="pln"> main</span><span class="pun">(</span><span class="kwd">void</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
	</span><span class="kwd">int</span><span class="pln"> result</span><span class="pun">,</span><span class="pln">num </span><span class="pun">=</span><span class="pln"> </span><span class="lit">3</span><span class="pun">;</span><span class="pln">
	printf</span><span class="pun">(</span><span class="str">"\n num = %d before function call."</span><span class="pun">,</span><span class="pln"> num</span><span class="pun">);</span><span class="pln">
	result </span><span class="pun">=</span><span class="pln"> mul_by_10</span><span class="pun">(</span><span class="pln">num</span><span class="pun">);</span><span class="pln">
	printf</span><span class="pun">(</span><span class="str">"\n result = %d after return from function"</span><span class="pun">,</span><span class="pln"> result</span><span class="pun">);</span><span class="pln">
	printf</span><span class="pun">(</span><span class="str">"\n num = %d"</span><span class="pun">,</span><span class="pln"> num</span><span class="pun">);</span><span class="pln">
	</span><span class="kwd">return</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">

</span><span class="com">/* function defi nition follows */</span><span class="pln">

</span><span class="kwd">int</span><span class="pln"> mul_by_10</span><span class="pun">(</span><span class="kwd">int</span><span class="pln"> num</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
	num </span><span class="pun">*=</span><span class="pln"> </span><span class="lit">10</span><span class="pun">;</span><span class="pln">
	</span><span class="kwd">return</span><span class="pln"> num</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
 </span>

Output:

 num = 3 before function call.
 result = 30 after return from function
 num = 3
 

Explanation:

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