Compilare: main.cpp: In function 'int cmmdc(int, int)': main.cpp:15:11: warning: left operand of comma operator has no effect [-Wunused-value] 15 | return("%d", a); | ^~~~ main.cpp: In function 'int main()': main.cpp:19:15: warning: unused variable 'k' [-Wunused-variable] 19 | int a,b,d,k; | ^