Compilare: user.cpp: In function ‘int main()’: user.cpp:47:49: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d%d%d\n",&n,&x1,&y1,&x2,&y2); ^ user.cpp:52:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%c%d\n",&c,&lung); ^