98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include <glib.h>
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typedef struct named_number_tag {
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const char* name;
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uint64_t number;
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} named_number;
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const named_number named_numbers[] = {
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{ "hundred", 100 },
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{ "thousand", 1000 },
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{ "million", 1000000 },
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{ "billion", 1000000000 },
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{ "trillion", 1000000000000 },
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{ "quadrillion", 1000000000000000ULL },
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{ "quintillion", 1000000000000000000ULL }
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};
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const named_number* get_named_number(uint64_t n) {
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const size_t names_len = sizeof(named_numbers)/sizeof(named_number);
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for (size_t i = 0; i + 1 < names_len; ++i) {
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if (n < named_numbers[i + 1].number)
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return &named_numbers[i];
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}
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return &named_numbers[names_len - 1];
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}
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size_t append_number_name(GString* str, uint64_t n) {
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static const char* small[] = {
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"zero", "one", "two", "three", "four", "five", "six", "seven", "eight",
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"nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen",
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"sixteen", "seventeen", "eighteen", "nineteen"
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};
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static const char* tens[] = {
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"twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"
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};
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size_t len = str->len;
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if (n < 20) {
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g_string_append(str, small[n]);
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}
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else if (n < 100) {
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g_string_append(str, tens[n/10 - 2]);
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if (n % 10 != 0) {
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g_string_append_c(str, '-');
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g_string_append(str, small[n % 10]);
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}
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} else {
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const named_number* num = get_named_number(n);
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uint64_t p = num->number;
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append_number_name(str, n/p);
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g_string_append_c(str, ' ');
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g_string_append(str, num->name);
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if (n % p != 0) {
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g_string_append_c(str, ' ');
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append_number_name(str, n % p);
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}
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}
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return str->len - len;
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}
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GString* magic(uint64_t n) {
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GString* str = g_string_new(NULL);
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for (unsigned int i = 0; ; ++i) {
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size_t count = append_number_name(str, n);
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if (i == 0)
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str->str[0] = g_ascii_toupper(str->str[0]);
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if (n == 4) {
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g_string_append(str, " is magic.");
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break;
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}
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g_string_append(str, " is ");
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append_number_name(str, count);
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g_string_append(str, ", ");
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n = count;
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}
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return str;
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}
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void test_magic(uint64_t n) {
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GString* str = magic(n);
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printf("%s\n", str->str);
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g_string_free(str, TRUE);
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}
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int main() {
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test_magic(5);
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test_magic(13);
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test_magic(78);
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test_magic(797);
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test_magic(2739);
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test_magic(4000);
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test_magic(7893);
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test_magic(93497412);
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test_magic(2673497412U);
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test_magic(10344658531277200972ULL);
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return 0;
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}
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