C: what does (int*)0 meaning

[hongbin1989]

setupterm(NULL, fileno(stdout), (int *)0);

[gerard4143]

(int *)0 creates a NULL integer pointer or a integer pointer equal to zero meaning it points to nothing....G4143

[hongbin1989]

thanks for it

[Rubberman]

The ANSI C standard allows leaving the cast (int*) off for a null value. IE, you can use "setupterm(0, fileno(stdio), 0)" instead. The gcc compiler suite for Linux is fully ANSI-compliant, and in fact the way I showed is actually preferable because NULL is a macro defined in a system header file to be (void*)0, which will not work if your function expects a char*, for example. However, 0 may be used for a null pointer of any type.