实验二

一

#include<stdio.h>
int main(){
 putchar(getchar());
 putchar(getchar());
 putchar(getchar());
 putchar(getchar());
 putchar(getchar());
 return 0;
}

 

二

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

 三

#include<stdio.h>
int main(){
 int a,b,c;
 scanf("%d %d %d",&a,&b,&c);
 if(a+b>c&&a+c>b&&b+c>a){
  if((a==b&&a!=c)||(a==c&&a!=b)||(b==c&&a!=b)){
   if((a*a+b*b==c*c)||(b*b+c*c==a*a)||(a*a+c*c==b*b)){
    printf("是等腰直角三角形"); 
   }else{
    printf("是等腰三角形");
   }
  }else if(a==b&&a==c){
   printf("是等边三角形");
  }else if((a*a+b*b==c*c)||(b*b+c*c==a*a)||(a*a+c*c==b*b)){
   printf("是直角三角形");
  }else{
   printf("是一般三角形");
   }
 }else{
  printf("不是");
 }
 return 0;
}

 

 

四

#include<stdio.h>
int main(){
 int a;
 int t;
 double rate,tax,profit;
 scanf("%d",&a);
 if(a<500){
  rate=0.00;
  t=1;
 }else if(a>=500&&a<1000){
  rate=0.05;
  t=2;
 }else if(a>=1500&&a<2000){
  rate=0.08;
  t=3;
 }else if(a>=2000&&a<5000){
  rate=0.10;
  t=4;
 }else{
  rate=0.15;
  t=5;
 }
 switch(t){
  case 1 :printf("rate=%.2f,tax=%.2f,prifit=%.2f",rate,rate*a,a*(1-rate));break;
  case 2 :printf("rate=%.2f,tax=%.2f,prifit=%.2f",rate,rate*a,a*(1-rate));break;
  case 3 :printf("rate=%.2f,tax=%.2f,prifit=%.2f",rate,rate*a,a*(1-rate));break;
  case 4 :printf("rate=%.2f,tax=%.2f,prifit=%.2f",rate,rate*a,a*(1-rate));break;
  case 5 :printf("rate=%.2f,tax=%.2f,prifit=%.2f",rate,rate*a,a*(1-rate));break;
 }
 return 0;
}