第七次作业

1编写程序，使用while语句求和sum1+3+5+7+…+21

#include <stdio.h>

main(){

         int i=1,sum=0;

         while(i<=21){

                  if(i%2!=0){

                  sum+=i;

                  }

                  i++;

                 

         }

                  printf("和是%d\n",sum);

 

}

 

2编写程序，使用while语句求和sum=1+1/3+1/5+…+1/n

include <stdio.h>

main(){

         int i=1,n;

         double sum=0;

         printf("请输入你想要加到的数：");

         scanf("%d",&n);

         while(i<=n){

                  if(i%2!=0){

                          printf("每一次进来的数i为%d\n",i);

                          sum+=1.0/i;

                          printf("这一次加和之后的和为%f\n",sum);

                  }

                  i++;

         }

         printf("总和为%f",sum);

}

 

3编写程序就阶乘f=1

#include <stdio.h>

main(){

         int i=1,n;

         long f=1;

                  scanf("%d",&n);

         while(i<=n){

                  f*=i;

                  i++;

         }

         printf("%d的阶乘是%d",n,f);

}

 

 

4打印出所有的水仙花数，所谓水仙花数就是指一个三位数其各位数字立方和等于该本身数

#include<stdio.h>

main(){

 int i=100,ge,shi,bai;

 while(i<=999){

  ge=i%10;

  shi=i/10%10;

  bai=i/100;

  if(ge*ge*ge+shi*shi*shi+bai*bai*bai==i){

   printf("%d\n",i);

  }

  i++;

 }

}

 

5输入两个数输出他们的中间数

 

#include <stdio.h>

main(){

         int a,b,i;

         scanf("%d%d",&a,&b);

         i=a+1;

         while(i<=b-1){

                  printf("%d\n",i);

                  i++;

         }

}

 

 

6输出1-100既能被3又能被5整除的数的和

#include <stdio.h>

main(){

         int i=1;

         while(i<=100){

                  if(i%3==0&&i%5==0){

                          printf("%d\n",i);

 

                  }

                  i++;

         }

}