Compilare: main.cpp: In function 'int add(int)': main.cpp:30:1: warning: no return statement in function returning non-void [-Wreturn-type] 30 | } | ^ main.cpp: In function 'int main()': main.cpp:54:16: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else] 54 | else if(op==2) | ^