ascii letters counter

main.c

#include <stdio.h>

int main(void) {
	char c = NULL;
	int letters = 0, numbers = 0;

	while(c != '\n') {
		scanf("%c", &c);
		if (c > 47 && c < 58)  // if it's a number
			numbers++;
		if (c > 96 && c < 123) // if it's a capital letter
			letters++;
		if (c > 64 && c < 91)  // if it's a letter
			letters++;
	}

	printf("%d\n%d\n", letters, numbers);

	return 0;
}