Compilare: user.c: In function ‘max’: user.c:16:6: warning: type of ‘a’ defaults to ‘int’ [enabled by default] long max(a,b) ^ user.c:16:6: warning: type of ‘b’ defaults to ‘int’ [enabled by default] user.c: At top level: user.c:30:1: warning: return type defaults to ‘int’ [enabled by default] main() ^ user.c: In function ‘main’: user.c:39:9: warning: implicit declaration of function ‘exit’ [-Wimplicit-function-declaration] exit(1); ^ user.c:39:9: warning: incompatible implicit declaration of built-in function ‘exit’ [enabled by default] user.c:47:9: warning: incompatible implicit declaration of built-in function ‘exit’ [enabled by default] exit(2); ^