あれ?枢軸ﾀｿいないの? (前ｽﾚ>>336改)

#include <stdio.h>
char *cnvRoman(int n)
{ switch(n){
case 1: return "I";
case 2: return "II";
case 3: return "III";
case 4: return "IV";
case 5: return "V";
case 6: return "VI";
case 7: return "VII";
case 8: return "VIII";
case 9: return "IX";
case 10: return "X";
case 11: return "XI";
case 12: return "XII";
case 13: return "XIII";
case 14: return "XIV";
case 15: return "XV";
default: break;
}
return "";
}
int main()
{ int n;
printf("1〜15迄ローマ数字変換するよ:");
scanf("%d",&n);
puts(cnvRoman(n));
return 0;
}