实验一

#include <stdio.h>
int main()
{
 int x;
printf("输入一个整数:\n");
scanf("%d",&x);
if(x%2==1)
printf("是奇数");
else 
printf("是偶数") ;
return 0;
 } 

#include <stdio.h>
int main(){
    int days;
    printf("输入一个整数:\n");
    scanf("%d",&days) ;
    if(1<=days&&days<=5)
printf("workdays,fighting\n");
else if(days==6||days==7)
printf("weekend,relax~\n");
else
printf("ooops,not in1~7\n");
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 ;
 
}