1writeln("Hello World!");21 -1e10 0xabcdef 'x'3[a] a->b a.b4!a ~a a++ a-- a*b a&b5a*b a/b a%b6a+b a-b7a<<b a>>b8a<b a<=b a>b a>=b9a==b a!=b10a&b11a^b12a|b13a&&b14a||b15a?b:z16a=b a+=b a-=b a*=b a/=b a%=b a<<=b a>>=b a&=b a^=b a|=b17a,y18a::b