程序代码：

#include"stdio.h"
void main()
{   
    int i;
        char s[][14]={
                        "illegal month",
                        "one",
                        "two",
                        "three",
                        "four",
                        "five",
                        "six",
                        "seven",
                        "eight",
                        "nine",
                        "ten",
                        "eleven",
                        "twelve"

                    };
    printf("input a number:\n");
    scanf("%d\n",&i);
    printf("%s\n",(i<1||i>12)?s[0]:s[i]);
}