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; 
 } 

#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("Ooop.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>=97&&ch<=122);
    ch=ch-('a'-'A');
     printf("%c\n",ch);
     
  return 0;
}