If you want to execute C program even after main function is terminated, which function can be used?

• exit() function terminates the program/process normally and returns the status code to the parent program/process.
• Syntax: void exit(int status)

• exit() is a system call which terminates current process. exit() is not an instruction of C language.
• Whereas, return() is a C language instruction/statement and it returns from the current function (i.e. provides exit status to calling function and provides control back to the calling function).

#define is a pre-processor directive which is used to define constant value. This constant can be any of the basic data types.

Below is the syntax for comments in C. The characters or words or anything which are given between “/*” and “*/”, won’t be considered by C compiler for compilation process. These will be ignored by C compiler during compilation.

Syntax: /* your comments here */

#pragma is a pre-processor macro in C. It is used to call a function before and after main function in a C program.

#include <stdio.h>

void function1( );
void function2( );

#pragma startup function1
#pragma exit function2

int main( )
{
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                    <small># Tutorial: Introduction about 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. &nbsp;How will you override an existing macro in C?</h5>
              </a>
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                     Answer: <p>To override an existing macro, we need to undefine existing macro using &ldquo;#undef&rdquo;. Then, we need to define same macro again with new value.</p>                  </div>
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                    <small># Tutorial: Introduction about Pre-processor</small> 
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                <small><i class="fa fa-code" aria-hidden="true"></i> Question: C Pre-processor</small>
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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. &nbsp;How to check whether macro is defined or not in a C program?</h5>
              </a>
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                     Answer: <p>#ifdef pre-processor directive checks whether particular macro is defined or not in a C program.</p>                  </div>
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                    <small># Tutorial: Introduction about Pre-processor</small> 
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                  <h5 class="mb-1" style="color:#194757;">667. &nbsp;What is the difference between memcpy() and strcpy() functions in C?</h5>
              </a>
            </div>
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                  <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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                    <small># Tutorial: All String Functions</small> 
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