Compilare: user.cpp: In function ‘int main()’: user.cpp:12:11: warning: unused variable ‘fout’ [-Wunused-variable] FILE *fout = fopen("spider-man.out", "w"); ^ user.cpp:14:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lf %lf %lf", &xc, &yc, &r); ^ user.cpp:16:55: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lf %lf %lf %lf", &x3, &y3, &x2, &y2); ^