1Foo():x(0&&1){}2cout<<"Hello World!\n"<<endl;31 -1e10 0xabcdef 'x'4[a] a->b a.b5!a ~a a++ a-- a*b a&b6a*b a/b a%b7a+b a-b8a<<b a>>b9a<b a<=b a>b a>=b10a==b a!=b11a&b12a^b13a|b14a&&b15a||b16a?b:z17a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b18a,y19a::b