Make a function which takes a character. If the character is a digit, output 1 and if English alphabet then output 0.

Question

I used this function but I don't know how it works? It is only taking care of digits, not the alphabet.

int is_digit(char c) {
return ('0' <= c) && (c <= '9');
}

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Answer 1

Martin Taylor as a beginner I don't know the difference between output and return. :(