Question

Why is 050 not equal to 50 in the following snippet?

#include <stdio.h>
int main(void) {
    int x=050,y=50;
    int ans;
    ans= x==y ? x+3 : y+7;
    printf("%d\n",ans);
}

Answer 1

Because 050 is considered octal and 50 is considered decimal.

So x = 050 basically means x = 40.

6.4.4.1/3

A decimal constant begins with a nonzero digit and consists of a
sequence of decimal digits. An octal constant consists of the prefix 0
optionally followed by a sequence of the digits 0 through 7 only.