吴云行的作业

//整数相除，116-1
#include<stdio.h>
int main()
{
 int a=5,b=7,c=100,d,e,f; 
 d=a/b*c;
 e=a*c/b;
 f=c/b*a;
 printf("d=%d,e=%d,f=%d\n",d,e,f);
 return 0;
}
 
116-2
#include<stdio.h> 
int main()
{
 int a=5,b=8; 
 printf("a++=%d\n",a++); 
 printf("a=%d\n",a);
 printf("++b=%d\n",++b);
 printf("b=%d\n",b);
 return 0;
}
 
116-3
#include<stdio.h>
int main()
{
 int a=5,b=8,c=8;
 printf("%d,%d,%d,%d\n",a==b&&a==c,a!=b&&a!=c,a>=b&&a>=c,a<=b&&a<=c);
 printf("%d,&d\n",a<=b||a>=c,a==b||b==c);
 printf("%d,%d,%d,%d\n",!(a==b),!(a>=b),!(a>=c),!(a<=b));
 return 0; 
}
 
// 程序功能： // 要求用户从键盘输入一个整数，判断其是奇数还是偶数
#include<stdio.h>
int main()
{
int x;
 
printf("请输入一个整数\n"); 
scanf("%d",&x);

if(x%2==0)
printf("是偶数\n");
else 
printf("是奇数\n");
}
 
 
 
//周末提醒
#include <stdio.h> 
int main() 
{
 int days;
 
 printf("输入一个整数: \n");
 scanf("%d",&days);
 if(0<days&&days<6) 
 printf("workdays, fighting\n");
 else if(days>=6 && (days-6)%10==0||days>=7 && (days-7)%10==0) // days是6或7 printf("weekend, relax~\n"); 
 printf("weekend, relax~\n");
 else
 printf("Ooops, not in 1~7\n");
 return 0;
}
 
 
//字母大小写
#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;
   
}

// Say hello to mars
# include<stdio.h>
int main()
{
    printf("Hello,Mars!");
    return 0;
}