Question

I wrote the following code with an expectation that it output 211, but when I compile and run it, I see 137.

Could someone please explain what’s going on? Thanks.

‎#include <stdio.h>

int main()
{
    int binary1,binary2;

    binary1 = 0100;
    binary2 = 0111;

    printf("%d\n", binary1 + binary2);

    return 0:
}

Answer 1

These are not binary numbers but octal (base 8):

binary1 = 0100; // = 64
binary2 = 0111; // = 64 + 8 + 1 = 73

printf("%d \n", binary1 + binary2); // = 64 + 73 = 137