Compilare: user.cpp: In function ‘int main()’: user.cpp:7: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:5: warning: ‘a1’ may be used uninitialized in this function user.cpp:5: warning: ‘a2’ may be used uninitialized in this function user.cpp:5: warning: ‘a3’ may be used uninitialized in this function user.cpp:5: warning: ‘a4’ may be used uninitialized in this function user.cpp:5: warning: ‘a5’ may be used uninitialized in this function