实验一 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("是奇数");
    else
      printf("是偶数");
      
    return 0;   
} 

#include <stdio.h>
int main()
{
    int days;
    scanf("%d",&days);
    printf("输入一个整数: \n");
    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-32;
    printf("%c\n",ch); 
    return 0;
}