Compilare: main.cpp: In function 'int main()': main.cpp:47:12: warning: unused variable 'j' [-Wunused-variable] int i, j, n, m; ^ main.cpp:51:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d" ,&m); ^ main.cpp:53:49: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lf%lf" ,&cat[i].x,&cat[i].y); ^ main.cpp:55:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d" ,&n); ^ main.cpp:57:51: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lf%lf" ,&cage[i].x,&cage[i].y); ^