Compilare: user.cpp: In function ‘int main()’: user.cpp:10:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&t); ^ user.cpp:13:87: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lf %lf %lf %lf %lf %lf %lf %lf " ,&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4); ^