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project euler 20 solution
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/* cc -of f.c -lgmp */ | |
#include <stdlib.h> | |
#include <stdio.h> | |
#include <gmp.h> | |
void factorize (mpz_t r, mpz_t n) | |
{ | |
mpz_t x; | |
mpz_init_set_ui(x, 1); | |
mpz_set_ui(r, 1); | |
while (mpz_cmp(x, n)) | |
{ | |
mpz_mul(r, x, r); | |
mpz_add_ui(x, x, 1); | |
} | |
} | |
void sumdigits (mpz_t r, mpz_t x) | |
{ | |
char *s, *p, c; | |
gmp_asprintf(&s, "%Zu", x); | |
mpz_set_ui(r, 0); | |
for (p = s; (c = *p); p++) | |
{ | |
mpz_add_ui(r, r, c - '0'); | |
} | |
free(s); | |
} | |
int main (int argc, char *argv[]) | |
{ | |
int i; | |
mpz_t n; | |
mpz_t f; | |
mpz_t s; | |
mpz_init(n); | |
mpz_init(f); | |
mpz_init(s); | |
for (i = 1; i < argc; i++) | |
{ | |
mpz_set_str(n, argv[i], 10); | |
factorize(f, n); | |
sumdigits(s, f); | |
gmp_printf("%s! = %Zu\tdigit sum = %Zu\n" , argv[i], f, s); | |
} | |
mpz_clear(n); | |
mpz_clear(f); | |
mpz_clear(s); | |
exit( (i > 1) ? EXIT_SUCCESS: EXIT_FAILURE ); | |
} |
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