Compilare: user.cpp: In function ‘void make_p()’: user.cpp:11:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k=0; ^ user.cpp: In function ‘int main()’: user.cpp:31:13: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] f>>a+1; ^ user.cpp:24:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k; ^ user.cpp:24:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k; ^