Compilare: user.cpp: In function ‘int main()’: user.cpp:20:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, " %d", & t); ^ user.cpp: In function ‘void f()’: user.cpp:50:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, " %d %d", & n, & m); ^ user.cpp:58:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, " %d %d", & a, & b); ^