#include <stdio.h>

int main(void)             编译的时候提示执行不到的代码
{
    unsigned int month = 0u;
    unsigned int data = 0u;
    unsigned int years = 0u;

    printf("输入三个整数: ");
    scanf("%u %u %u\n",&month,&data,&years);
      
    if(data <=31 && data >= 1)
        {if(data == 1 || data == 21 || data == 31)
            printf("%u st\n",data);
         if(data == 2 || data == 22)
            printf("%u nd\n",data);
         if(data == 3 || data == 23)
            printf("%u rd\n",data);
         if(data >=4 && data <= 31)
            printf("%u th\n",data);
        }
    else
      printf("请输入1到31之间的整数");


    if(month >= 1 && month <= 12)
                {if(month==1)
                    printf(" January");
                 else if(month==2)
                    printf(" Februar");
                 else if(month==3)
                    printf(" March");
                 else if(month==4)
                    printf(" April");
                 else if(month==5)
                    printf(" May");
                 else if(month==6)
                    printf(" June");
                 else if(month==7)
                    printf(" July");
                 else if(month==8)
                    printf(" August");
                 else if(month==9)
                    printf(" September");
                 else if(month==10)
                    printf(" October");
                 else if(month==11)
                    printf(" November");
                 else if(month==12)
                    printf(" December");
                }
     else
       printf("请输入1到12之间的整数");

    if(years <= 1900 && years >= 2099)
       printf("%u\n",years);
    else
      printf("请输入1900到2099之间的整数");

   return 0;
}

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