C atexit() function
C atexit() function - Processes the specified function at exit
Syntax atexit() function
int atexit(void (*func)(void))
The atexit() function is used to register the function pointed to by func, to be called without arguments at normal program termination.
Parameters atexit() function
Name | Description | Required /Optional |
---|---|---|
func | Function to be called. | Required |
Return value from atexit()
- Upon successful completion, atexit() shall return 0.
- Otherwise, it shall return a non-zero value.
Example: atexit() function
The following example shows the usage of atexit() function.
#include <stdlib.h>
#include <stdio.h>
void test1(void), test2(void), test3(void), test4(void);
int main( void )
{
atexit(test1);
atexit(test2);
atexit(test3);
atexit(test4);
printf("From Main function....!\n");
}
void test1()
{
printf( "Function1 \n" );
}
void test2()
{
printf( "Function2 \n" );
}
void test3()
{
printf( "Function3 \n" );
}
void test4()
{
printf( "Function4 \n" );
}
Output:
From Main function....! Function4 Function3 Function2 Function1
C Programming Code Editor:
Previous C Programming: C abort()
Next C Programming: C exit()
C Programming: Tips of the Day
What's the point of const pointers?
const is a tool which you should use in pursuit of a very important C++ concept:
Find bugs at compile-time, rather than run-time, by getting the compiler to enforce what you mean.
Even though it does not change the functionality, adding const generates a compiler error when you're doing things you didn't mean to do. Imagine the following typo:
void foo(int* ptr) { ptr = 0;// oops, I meant *ptr = 0 }
If you use int* const, this would generate a compiler error because you're changing the value to ptr. Adding restrictions via syntax is a good thing in general. Just don't take it too far -- the example you gave is a case where most people don't bother using const.
Ref : https://bit.ly/33Cdn3Q
- Weekly Trends
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join
- JavaScript functions Exercises
- Python Tutorial
- Python Array Exercises
- SQL Cross Join
- C# Sharp Array Exercises