实验1 C语言开发环境和数据类型、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==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(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; 
}

#include<stdio.h>
int main()
{
    printf("输入一个两位十进制数：\n");
    int x,a,b,c,d,e,f,g ;
    scanf("%d",&x);
    
    a=x%2;
    x=x/2;
    
    b=x%2;
    x=x/2;
    
    c=x%2;
    x=x/2;
    
    d=x%2;
    x=x/2;
    
    e=x%2;
    x=x/2;
    
    f=x%2;
    x=x/2;
    
    g=x%2;
    x=x/2;
    
    printf("二进制位：%d%d%d%d%d%d%d\n",g,f,e,d,c,b,a);
    
    return 0;

}