实验

#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);

printf("\n");

return 0;

}

 

#include <stdio.h>

#include <math.h>

int main(){

int year,month,days;

month=2;

printf("input the year:");
scanf("%d",&year);

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

{  

days=29;  

printf("year:%d,month:2,days:%d\n",year,days);

}

else

{

 days=28;

 printf("year:%d,month=2,days:%d\n",year,days);

}

return 0;

}

 

#include <stdio.h>

#include <math.h>

int main()

{

double a,rate,tax,profit;

printf("input a:");

scanf("%lf",&a);

if (a<500)

{

 rate=0.00;

 tax=a*rate;  

profit=a-tax;

 printf("a=%lf\n",a);

 printf("rate=%lf\n",rate);

 printf("tax=%lf\n",tax);

 printf("profit=%lf\n",profit);

}

else if(500<=a<1000)

{  rate=0.05;  

tax=a*rate;

 profit=a-tax;

 printf("a=%lf\n",a);

 printf("rate=%lf\n",rate);

 printf("tax=%lf\n",tax);

 printf("profit=%lf\n",profit);

}

else if(1000<=a<2000)

{  

rate=0.08;

 tax=a*rate;  

profit=a-tax;

 printf("a=%lf\n",a);

 printf("rate=%lf\n",rate);

 printf("tax=%lf\n",tax);

 printf("profit=%lf\n",profit);

}

else if(2000<=a<5000)

{  rate=0.10;

 tax=a*rate;

 profit=a-tax;

 printf("a=%lf\n",a);

 printf("rate=%lf\n",rate);

 printf("tax=%lf\n",tax);

 printf("profit=%lf\n",profit); }

else if(5000<=a)

{  rate=0.15;  

tax=a*rate;

 profit=a-tax;

 printf("a=%lf\n",a);  

printf("rate=%lf\n",rate);

 printf("tax=%lf\n",tax);

 printf("profit=%lf\n",profit);

}

return 0;

}