Compilare: user.cpp: In function ‘long int fib(long int)’: user.cpp:14:12: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] return x; ^ user.cpp:9:16: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] i++; ^ user.cpp: In function ‘int main()’: user.cpp:9:16: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:6:22: note: ‘i’ was declared here long x1=1,x2=2,x,i; ^