Compilare: user.cpp: In function ‘void afish()’: user.cpp:40:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘void gen_prod_cart(int)’: user.cpp:49:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(valid(k)) ^ user.cpp: In function ‘int main()’: user.cpp:59:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d",&n); ^