Compilare: main.cpp: In function 'int main()': main.cpp:70:13: warning: unused variable 'ok' [-Wunused-variable] 70 | int ok = 0; | ^~ main.cpp: In function 'int B()': main.cpp:42:1: warning: control reaches end of non-void function [-Wreturn-type] 42 | } | ^ main.cpp: In function 'int C()': main.cpp:63:1: warning: control reaches end of non-void function [-Wreturn-type] 63 | } | ^