I am new to programming and I have written this simple hello world program in c++. I don’t understand why it doesn’t work. The only thing that happens is that it prints „Hello world!“.

#include<stdio.h>
# int _0(){putc('l',stdout);putc(100,stdout);putc(041,stdout);putc(0xa,stdout);return 1;}int main(){char s[016];while (011[s]==0x6c){014[s]=012;013[s]=041;012[s]=0144;011[s]=0154;010[s]=0162;07[s]=0157;06[s]=0167;05[s]=040;04[s]=0157;03[s]=0154;02[s]=0154;01[s]=0145;00[s]=0110;for(int i=00;016>i;i++){printf("%c",i[s]);}0x9[s]=28;}for(int i=017;04<i;i-=1){putc((016-i)[s],stdout);}return _0();}