实验1

#include<stdio.h>
#include<stdlib.h>
int main()
 {  int a;
    printf("请输入一个整数:");
    scanf("%d",&a);
    if(a%2==0)
    printf("%d为偶数!",a);
    else
    printf("%d为奇数！");
    system("pause");
    return 0;
}

#include<stdio.h>
int main()
  {
    char ch;
    printf("输入一个字符：\n");
    scanf("%c",&ch);
     if(ch>=97&&ch<=122)
       ch=ch-32;
    printf("%c\n",ch);
    return 0;
}

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