Compilare: user.cpp: In function ‘bool calc()’: user.cpp:48:10: warning: suggest parentheses around assignment used as truth value [-Wparentheses] a=b=c=s1=s2=0; ^ user.cpp:47:15: warning: variable ‘aux’ set but not used [-Wunused-but-set-variable] int s1,s2,aux; ^ user.cpp: In function ‘int get_type()’: user.cpp:42:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ /tmp/ccj48SXT.o: In function `main': user.cpp:(.text.startup+0x4d): warning: the `gets' function is dangerous and should not be used.