Compilare: main.cpp:29:9: warning: "/*" within comment [-Wcomment] 29 | /*lengh=a+b-7; | main.cpp: In function 'int main()': main.cpp:9:12: warning: variable 'a2' set but not used [-Wunused-but-set-variable] 9 | double a2,b2; | ^~ main.cpp:9:15: warning: variable 'b2' set but not used [-Wunused-but-set-variable] 9 | double a2,b2; | ^~