Compilare: user.cpp: In function ‘int main()’: user.cpp:10:6: warning: unused variable ‘i’ [-Wunused-variable] int i,j,L,N=0,mask=0,first_space=1; ^ user.cpp:10:8: warning: unused variable ‘j’ [-Wunused-variable] int i,j,L,N=0,mask=0,first_space=1; ^ user.cpp:10:10: warning: unused variable ‘L’ [-Wunused-variable] int i,j,L,N=0,mask=0,first_space=1; ^ user.cpp:10:16: warning: unused variable ‘mask’ [-Wunused-variable] int i,j,L,N=0,mask=0,first_space=1; ^ user.cpp:10:23: warning: unused variable ‘first_space’ [-Wunused-variable] int i,j,L,N=0,mask=0,first_space=1; ^