Compilare: user.c: In function ‘main’: user.c:16:5: warning: format ‘%d’ expects argument of type ‘int *’, but argument 3 has type ‘long int *’ [-Wformat=] fscanf(in, "%d", &a); ^ user.c:17:5: warning: format ‘%d’ expects argument of type ‘int *’, but argument 3 has type ‘long int *’ [-Wformat=] fscanf(in, "%d", &b); ^ user.c:18:5: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long int’ [-Wformat=] fprintf(out, "%d", euclid(a,b)); ^ user.c:19:5: warning: implicit declaration of function ‘close’ [-Wimplicit-function-declaration] close(in); ^ user.c:16:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &a); ^ user.c:17:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &b); ^