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#include "stdlib.h"
#include "string.h"
#include "stdio.h"
typedef struct {
int value;
char *symbol;
} SymTableEntry;
SymTableEntry sym_table[] = {
{1000, "M"},
{900, "CM"},
{500, "D"},
{400, "CD"},
{100, "C"},
{90, "XC"},
{50, "L"},
{40, "XL"},
{10, "X"},
{9, "IX"},
{5, "V"},
{4, "IV"},
{1, "I"},
{-1, NULL},
};
char *concat(char *prev, char *sym) {
int prevlen = strlen(prev);
int symlen = strlen(sym);
char *res = malloc(prevlen + symlen + 1);
memcpy(res, prev, prevlen);
memcpy(res + prevlen, sym, symlen);
res[prevlen + symlen] = '\0';
free(prev);
return res;
}
char* intToRoman(int num) {
char *r = malloc(1);
r[0] = '\0';
while (num > 0) {
for (int i = 0; ; i++) {
if (sym_table[i].value < 0) break;
if (sym_table[i].value <= num) {
num -= sym_table[i].value;
r = concat(r, sym_table[i].symbol);
break;
}
}
}
return r;
}
int main() {
printf("%s\n", intToRoman(1234));
return 0;
}
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