作业实验一

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