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Look for 48 in the 'dec' column, you'll find the character 0 there. The nonprinting characters are in a separate section above the printing section, in it you'll find many characters which aren't...

The binary value for an ASCII '0' looks like 01100000.

The binary value for a numeric 48 looks like 01100000.

You might notice a certain resemblance between the two... They're all just...

It would be non-printable control characters if you dumped it into the terminal raw. That's why you use printf("%d", num) to print it and don't dump it into the terminal raw.

But, they're all...

The C Standard requires:
The reference to the above list is the list of the ten decimal digits starting with 0 and followed in order the by the digits 1 through 9. In a C source program an integer...

In addition to what Corona688 has already said, I need to comment on other aspects of your program. Any results that you get from this code are unreliable and suspect. First let me add line numbers...

The first 16 characters of ASCII, including zero, are nonprinting control characters. The ASCII letter '0' is not the binary number 0. Try this:

printf("%d\n", 0);
printf("%d\n", '0');

It's...