Compilare: user.c: In function ‘main’: user.c:6:3: warning: passing argument 2 of ‘fopen’ makes pointer from integer without a cast [enabled by default] f = fopen("cmmdc.in", 'r'); ^ In file included from user.c:1:0: /usr/include/stdio.h:249:14: note: expected ‘const char * restrict’ but argument is of type ‘int’ extern FILE *fopen (__const char *__restrict __filename, ^ user.c:7:3: warning: passing argument 2 of ‘fopen’ makes pointer from integer without a cast [enabled by default] g = fopen("cmmdc.out", 'w'); ^ In file included from user.c:1:0: /usr/include/stdio.h:249:14: note: expected ‘const char * restrict’ but argument is of type ‘int’ extern FILE *fopen (__const char *__restrict __filename, ^