Usage of several C functions learned today (atexit, atoi, atof, ATOL)

Usage of several C functions learned today (atexit, atoi, atof, ATOL)

22:52:17

Function Name: atexit Function: registers the termination function. It is called after the main function is completed; Usage: int atexit (atexit_t func ); Program example: # Include <stdio. h> # Include <stdlib. h> Void exit_fn1 (void) { Printf ("exit function #1 called/N "); } Void exit_fn2 (void) { Printf ("exit function #2 called/N "); } Int main (void) { /* Post exit function #1 */ Atexit (exit_fn1 ); /* Post exit function #2 */ Atexit (exit_fn2 ); Return 0; } Function name: atoi Function: converts a string to an integer. Usage: int atoi (const char * nptr ); Program example: # Include <stdlib. h> # Include <stdio. h> Int main (void) { Int N; Char * STR = "12345.67 "; N = atoi (STR ); Printf ("string = % s integer = % d/N", STR, N ); Return 0; } Function name: atof Function: converts a string to a floating point number. Usage: Double atof (const char * nptr ); Program example: # Include <stdlib. h> # Include <stdio. h> Int main (void) { Float F; Char * STR = "12345.67 "; F = atof (STR ); Printf ("string = % s float = % F/N", STR, F ); Return 0; }