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#include <stdio.h> int is_odd(unsigned n); int is_even(unsigned n); int is_even(unsigned n) { return n == 0 ? 0 : is_odd(n-1); } int is_odd(unsigned n) { return n == 0 ? 0 : (n == 1 ? 1 : is_even(n-1)); } int main(void) { const unsigned num = 33; printf("%u is %s\n", num, is_even(num) ? "even" : "odd"); return 0; }
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