The function atexit () in C

Int atexit function (void (* func) (void)) calls function func when the program ends. You can register your end function (func function) wherever you like, but this function will be called at the end of the program.

Declare the function atexit () in C

Below is the declaration for atexit () in C:

 int  atexit ( void (* func )( void )) 

Parameters

func : This is the function to be called at the end of the program.

Returns the value

This function returns a value of 0 if this function is successfully registered. If it fails, it returns a value other than 0.

For example

The following program C illustrates the usage of atexit () in C:

 #include #include void  functionA  () {  printf ( "Vi du mot ham functionAn" ); } int  main  () { /* Dang ky mot ham ket thuc chuong trinh */  atexit ( functionA  );  printf ( "Bat dau chay phan chuong trinh chinh .n" );  printf ( "Thoat chuong trinh chinh .n" ); return ( 0 ); } 

Compiling and running the above C program will result:

According to Tutorialspoint

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