What does (char *)0 mean in c?

Question

if ( fgets( line, sizeof(line), stdin ) == (char*) 0 )...

I don\'t understand what this line does,anyone knows?

Answer 1

The line checks if fgets return 0. The cast to char* is only to match the return type of fgets:

char * fgets ( char * str, int num, FILE * stream );

But 0 is implicit converted to char* if you remove it.

If you need more information on fgets look here