实验二

#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('\n');
 return 0;
}

 

 

 

#include <stdio.h>
int main()
{
 int a;
 printf("input the year:");
 scanf("%d",&a);
 if(a%4!=0)
  printf("year:%d,month:2,days:28",a);
 else
  if(a%100!=0)
   printf("year:%d,month:2,days:29",a);
  else
   if(a%400!=0)
    printf("year:%d,month:2,days:29",a);
   else
    printf("year:%d,month:2,days:28",a);
 printf("\n");
 return 0;
}

#include <stdio.h>
int main()
{
 int a,b,c;
 scanf("%d,%d,%d",&a,&b,&c);
 if(a+b>c&&a-b<c){
  if(a==b&&b==c){
   printf("等边三角形\n");}
  if(a==b&&b!=c){
   printf("等腰三角形\n");}
  if((a*a==b*b+c*c)||(b*b==a*a+c*c)||(c*c==a*a+b*b)){
   printf("直角三角形\n");}
  if((a!=b&&b!=c)&&(a*a!=b*b+c*c)&&(b*b!=a*a+c*c)&&(c*c!=a*a+b*b)){
   printf("一般三角形\n");}}
 else
 {printf("不能构成三角形\n");}
 return 0;
}

#include <stdio.h>
int main()
{
 double a;
 scanf("%lf",&a);
 if(a<500)
  
  printf("a=%lf rate=0.00 tax=%lf profit=%lf\n",a,a*0.00,a);
 else if(a>=500&&a<1000)
  printf("a=%lf rate=0.05 tax=%lf profit=%lf\n",a,a*0.05,a*0.95);
 else if(a>=1000&&a<2000)
 
  printf("a=%lf rate=0.08 tax=%lf profit=%lf\n",a,a*0.08,a*0.92);
 else if(a>=2000&&a<5000)
 
  printf("a=%lf rate=0.10 tax=%lf profit=%lf\n",a,a*0.10,a*0.90);
 else if(a>=5000)
 
  printf("a=%lf rate=0.15 tax=%lf profit=%lf\n",a,a*0.15,a*0.85);
 return 0;
}