Compilare: main.cpp: In function 'int main()': main.cpp:13:10: warning: unused variable 'ch1' [-Wunused-variable] char ch1,ch2; ^~~ main.cpp:13:14: warning: unused variable 'ch2' [-Wunused-variable] char ch1,ch2; ^~~ main.cpp:15:9: warning: unused variable 'r' [-Wunused-variable] int r = 0,cif,n,i; ^ main.cpp:15:15: warning: unused variable 'cif' [-Wunused-variable] int r = 0,cif,n,i; ^~~ main.cpp:15:19: warning: unused variable 'n' [-Wunused-variable] int r = 0,cif,n,i; ^ main.cpp:15:21: warning: unused variable 'i' [-Wunused-variable] int r = 0,cif,n,i; ^