Compilare: user.c: In function ‘main’: user.c:6:2: warning: passing argument 2 of ‘fopen’ makes pointer from integer without a cast [enabled by default] FILE *IN = fopen("adunare.in", 'r'); ^ In file included from user.c:1:0: /usr/include/stdio.h:273:14: note: expected ‘const char * restrict’ but argument is of type ‘int’ extern FILE *fopen (__const char *__restrict __filename, ^ user.c:7:2: warning: passing argument 2 of ‘fopen’ makes pointer from integer without a cast [enabled by default] FILE *OUT = fopen("adunare.out", 'w'); ^ In file included from user.c:1:0: /usr/include/stdio.h:273:14: note: expected ‘const char * restrict’ but argument is of type ‘int’ extern FILE *fopen (__const char *__restrict __filename, ^ user.c:9:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN, "%d %d", &a, &b); ^