实验1

/*This is first C program*/
# include<stdio.h>
int main()
{
    printf("201883300106");
    return 0;
 } 

#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 in 1~7\n");
    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("Goops, 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; 
}