#include <stdio.h>

int main ()

{

    int x;

    printf("输入一个整数：\n");

    scanf("%d",&x);

    if(x%!=)

    printf("是奇数");

    else

    printf("是偶数");

    return ;

}

#include <stdio.h>

int main ()

{

    int days;

    printf("输入一个整数：\n");

    scanf("%d",&days);

    if(days>=,days<=)

      printf("workdays,fighting\n");

    else if(days<)

      printf("weekend, relax~\n");

    else

      printf("Ooops, not in 1~7\n");

    return ;

}

#include<stdio.h>

int main()

{

    char ch;

    printf("输入一个字符：\n");

    scanf("%c", &ch);

    if(ch<)

    printf("%c\n",ch);

    else

    ch=ch - ;

    printf("%c\n",ch);

    return ;

}