这个奇葩

1、

#include <stdio.h>

int main(void)
{
    int i;
    puts("please input a month.");
    printf("month i: "); scanf("%d",&i);
    
    if (i >= 3 && i <= 5)
        {
            printf("%d is spring\n",i);
        }
    else
        {
            if (i >= 6 && i <= 8)
                {
                    printf("%d is summer\n",i);
                }
            else
                {
                    if (i >= 9 && i <= 11)
                        {
                            printf("%d is autumn\n",i);
                        }
                    else
                        {
                            if (i == 12 || i == 1 || i == 2)
                                {
                                    printf("%d is winter\n",i);
                                }
                            else
                                {
                                    printf("%d is not exist!!!!\a\n");
                                }
                        }
                }
        }
    return 0;
        
}

2、等价于1

#include <stdio.h>

int main(void)
{
    int i;
    puts("please input a month.");
    printf("month i: "); scanf("%d",&i);
    
    if (i >=3 && i <= 5)
        printf("%d is spring!\n");
    else if (i >= 6 && i <= 8)
        printf("%d is summer!\n");
    else if (i >= 9 && i <= 11)
        printf("%d is autumn1\n");
    else if (i == 12 || i == 1 || i == 2)
        printf("%d is winter!\n");
    else
        printf("%d is not exist!!!\a\n");
    return 0;
}