Hvorfor brug af "indirection operator" her?!
Hej.Er der nogen der kan forklare hvorfor man bruger indirection operator i nedenstående while.
/* Demonstrates using the gets() return value. */
#include <stdio.h>
/* Declare a character array to hold input, and a pointer. */
char input[257], *ptr;
int main( void )
{
/* Display instructions. */
puts("Enter text a line at a time, then press Enter.");
puts("Enter a blank line when done.");
/* Loop as long as input is not a blank line. */
while ( *(ptr = gets(input)) != NULL)
printf("You entered %s\n", input);
puts("Thank you and good-bye\n");
return 0;
}
Hvorfor er det ikke: while ( (ptr = gets(input)) != NULL)
