In C storing values that start with zero get mutated, why?

Question

For example:

int main(){

    int x = 01234567;

    printf(\"\\n%d\\n\",x);

    return 0;

}

The following code produces: 342391

Answer 1

Integer constants written with a leading 0 are interpreted as octal (base-8), not decimal (base-10). This is analogous to 0x triggering hexadecimal (base-16) interpretation.

Basically all you can do here is not put leading 0s on your integer constants.