实验1

include <stdio.h>
int main()
{
    int x;
    printf("输入一个整数:\n");
    scanf("%d",&x);
    if(x%2!=0)
        printf("是奇数");
    else
        printf("是偶数");
        
    return 0;    
        
}

int main()
{
    int days;
    scanf("%d",&days);
    printf("输入一个整数: \n");
    if(days>=1&&days<=5)
        printf("workdays,fighting\n");
    else if(days==6||days==7)
        printf("weekend, relax~\n");
    else 
        printf("ooops, not in 1~7\n");
        
    return 0;    
        
}

#include <stdio.h>
int main()
{
    char ch;
    printf("输入一个字符:\n");
    scanf("%c",&ch);
    if(ch>='a'&&ch<='z')
       ch=ch-32;
    printf("%c\n",ch); 
    return 0;
}