实验1 C语言开发环境使用和数据类型、运算符、表达式

#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;
}