Compilare: user.cpp: In function ‘int main()’: user.cpp:58:26: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long int’ [-Wformat=] fprintf(out,"%d\n", nr); ^ user.cpp:24:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%ld", &n); ^ user.cpp:28:65: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%ld %ld %ld", &a[i].x, &a[i].y, &a[i].r); ^