Out put of this code

Question

int n = 0123;
cout<<n;

Answer 1

When any number start with 0 the compiler treat it as octal number in general and if number start with 0x then it is hexadecimal number.
So 0123 is an octal number so convert it in decimal will give
0123= 0*8^3+1*8^2+2*8^1+3*8^0
So it return 0+64+16+3=83 so output is 83
although you can run the code in playground and see the output