Compilare: user.cpp:5:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^ user.cpp: In function ‘int main()’: user.cpp:10:9: warning: unused variable ‘i’ [-Wunused-variable] int x,y,i,k; ^ user.cpp:10:11: warning: unused variable ‘k’ [-Wunused-variable] int x,y,i,k; ^ user.cpp:12:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d ", &x); ^ user.cpp:13:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d ", &y); ^