Compilare: user.cpp: In function ‘int main()’: user.cpp:11:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&i); ^ user.cpp:12:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&j); ^ user.cpp:26:13: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] k = i - k; ^