Answer:
#pragma is a pre-processor macro in C. It is used to call a function before and after main function in a C program.
<![CDATA[
#include <stdio.h>
void function1( );
void function2( );
#pragma startup function1
#pragma exit function2
int main( )
{
</div>
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<a style="color:#9e9d9d;" href="/tutorial/introduction-about-pre-processor/1/376">
<small># Tutorial: Introduction about Pre-processor</small>
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<a style="color:#9e9d9d;" href="/qa/-/1/36">
<small><i class="fa fa-code" aria-hidden="true"></i> Question: C Pre-processor</small>
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<a href="/qanswer/how-will-you-override-an-existing-macro-in-c-question/36/665">
<h5 class="mb-1" style="color:#194757;">665. How will you override an existing macro in C?</h5>
</a>
</div>
<div class="card">
<div class="card-body">
Answer: <p>To override an existing macro, we need to undefine existing macro using “#undef”. Then, we need to define same macro again with new value.</p> </div>
</div>
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<a style="color:#9e9d9d;" href="/tutorial/introduction-about-pre-processor/1/376">
<small># Tutorial: Introduction about Pre-processor</small>
</a>
</div>
<a style="color:#9e9d9d;" href="/qa/-/1/36">
<small><i class="fa fa-code" aria-hidden="true"></i> Question: C Pre-processor</small>
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<span class="float-end" style="color:#9e9d9d"> <small><i class="fa fa-check" aria-hidden="true"></i> Short </small></span>
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<a href="/qanswer/how-to-check-whether-macro-is-defined-or-not-in-a-c-program-question/36/666">
<h5 class="mb-1" style="color:#194757;">666. How to check whether macro is defined or not in a C program?</h5>
</a>
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<div class="card-body">
Answer: <p>#ifdef pre-processor directive checks whether particular macro is defined or not in a C program.</p> </div>
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<a style="color:#9e9d9d;" href="/tutorial/introduction-about-pre-processor/1/376">
<small># Tutorial: Introduction about Pre-processor</small>
</a>
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<a style="color:#9e9d9d;" href="/qa/-/1/36">
<small><i class="fa fa-code" aria-hidden="true"></i> Question: C Pre-processor</small>
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<a href="/qanswer/what-is-the-difference-between-memcpy-and-strcpy-functions-in-c-question/52/667">
<h5 class="mb-1" style="color:#194757;">667. What is the difference between memcpy() and strcpy() functions in C?</h5>
</a>
</div>
<div class="card">
<div class="card-body">
Answer: <ul>
<li>memcpy() function is used to copy a specified number of bytes from one memory to another. Whereas, strcpy() function is used to copy the contents of one string into another string.</li>
<li>memcpy() function acts on memory rather than value. Whereas, strcpy() function acts on value rather than memory.</li>
</ul> </div>
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<a style="color:#9e9d9d;" href="/tutorial/all-string-functions/1/261">
<small># Tutorial: All String Functions</small>
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<a style="color:#9e9d9d;" href="/qa/-/1/52">
<small><i class="fa fa-code" aria-hidden="true"></i> Question: String functions in C </small>
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<a href="/qanswer/what-is-the-difference-between-memcpy-and-memmove-functions-in-c-question/29/668">
<h5 class="mb-1" style="color:#194757;">668. What is the difference between memcpy() and memmove() functions in C?</h5>
</a>
</div>
<div class="card">
<div class="card-body">
Answer: <ul>
<li>memcpy() function is is used to copy a specified number of bytes from one memory to another.</li>
<li>memmove() function is used to copy a specified number of bytes from one memory to another or to overlap on same memory.</li>
<li>Difference between memmove() and memcpy() is, overlap can happen on memmove(). Whereas, memory overlap won’t happen in memcpy() and it should be done in non-destructive way.</li>
</ul> </div>
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<a style="color:#9e9d9d;" href="/tutorial/introduction-to-string/1/216">
<small># Tutorial: Introduction to String</small>
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<a style="color:#9e9d9d;" href="/qa/-/1/29">
<small><i class="fa fa-code" aria-hidden="true"></i> Question: String in C Language</small>
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<a href="/qanswer/is-there-any-inbuilt-library-function-in-c-to-remove-leading-and-trailing-spaces-from-a-string-how-will-you-remove-them-in-c-question/30/669">
<h5 class="mb-1" style="color:#194757;">669. Is there any inbuilt library function in C to remove leading and trailing spaces from a string? How will you remove them in C?</h5>
</a>
</div>
<div class="card">
<div class="card-body">
Answer: <ul>
<li>There is no inbuilt function to remove leading and trailing spaces from a string in C. We need to write our own function to remove them.</li>
<li>We need to check first non-space character in given string. Then, we can copy that string from where non space character is found. Then, we can check whether any spaces are available in copied string from the end of the string. If space is found, we can copy ‘\0’ in that space until any character is found. Because, ‘\0’indicates the end of the string. Now, we have removed leading and trailing spaces in a given string.</li>
<li></li>
</ul> </div>
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<a style="color:#9e9d9d;" href="/tutorial/predefined-functions/1/391">
<small># Tutorial: Predefined Functions</small>
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<a style="color:#9e9d9d;" href="/qa/-/1/30">
<small><i class="fa fa-code" aria-hidden="true"></i> Question: Function in C Language</small>
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<li class="list-group-item d-flex justify-content-between align-items-center main-gradient-tutorials mb-2"><a href="http://www.atnyla.com/fundamentals-of-c-language/1/20"><i class="fa fa-code" aria-hidden="true"></i> Chapterwise C Program</a></li>
<li class="list-group-item d-flex justify-content-between align-items-center main-gradient-tutorials mb-2"><a href="http://www.atnyla.com/array/3/54"><i class="fa fa-code" aria-hidden="true"></i> Chapterwise Data Structure Program</a></li>
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