c实验2

#include <stdio.h>

int main()

{

         char a,b,c,d,e;

    a=getchar();

    b=getchar();

    c=getchar();

    d=getchar();

    e=getchar();

    putchar(a);

    putchar(b);

    putchar(c);

    putchar(d);

    putchar(e);

         putchar(' ');

return 0;

}

 

#include <stdio.h>

int main()

{

         int year,days,month;

         printf("input the year:");

         scanf("%d",&year);

         if((year%4==0&&year%100!=0)||year%400==0)

         {        month=2;

           days=29;

           printf("year:%d month:%d days:%d",year,month,days);}

    else

         {month=2;

         days=28;

         printf("year:%d month:%d days:%d ",year,month,days);}

return 0;

}

#include<stdio.h>
#include<stdlib.h>
int main()
{
 int a, b, c;
 printf("input three numbers: ");
 scanf("%d", &a);
 scanf("%d", &b);
 scanf("%d", &c);
 if (a + b > c && a + c > b && b + c > a)
 {
  if (a == b || a == c || b == c)
  {
   if (a == b && b == c)
   {
    printf("等边三角形 ");
   }
   else if (a * a + b * b == c * c || a * a + c * c == b * b || b * b + c * c == a * a)
   {
    printf("等腰直角三角形 ");
   }
   else
   {
    printf("等腰三角形 ");
   }
  }
  else if(a * a + b * b == c * c || a * a + c * c == b * b || b * b + c * c == a * a)
  {
   printf("直角三角形 ");
  }
  else
  {
   printf("一般三角形 ");
  }
 }
 else
 {
  printf("构不成三角形 ");
 }
 system("pause");
 return 0;
}

#include<stdio.h>

int main()

{

         double a,rate,tax,profit;

         scanf("%lf",&a);

         if(a<500.00){rate=0.00;}

         else if(500<=a&&a<1000){rate=0.05;}

         else if(1000<=a&&a<2000){rate=0.08;}

         else if(2000<=a&&a<5000){rate=0.10;}

         else if(a>=5000){rate=0.15;}

         tax=a*rate;

         profit=a-tax;

         printf("a=%lf rate=%lf tax=%lf profit=%lf",a,rate,tax,profit);

return 0;

}