补做作业2

来源：互联网发布：上海二手住宅成交数据编辑：程序博客网时间：2024/05/01 00:24

1.已知n,计算n以内的所有素数之和sum 。

#include <iostream.h>#include <fstream.h>#include <stdio.h>void writeinfile(int n);void main(){int  n,k,m,l,sum=0;n=100;/**********Program**********/n=0;for(m=1;m<=200;m++){ s=0;for (k=1;k<m;k++); {  if(m%k==0)   s=s+k; }if(s==m){cout<<m<<endl;n++;}cout<<n<<endl/**********  End  **********/writeinfile(sum);}void writeinfile(int n){fstream myfile;myfile.open(" f.txt" ,ios::out);myfile<<n<<endl;myfile.close();}

#include <fstream.h>#include <iostream.h>int fun(int a[],int num){/**********Program**********/int i,j;for(i=0;i<=9;i++)if(num==a[i])    return 1;else   return 0;/**********  End  **********/}void main(){           int a[10]={54,256,563,754,34,56,345,543,45,65};       int num = 46;           if (fun(a,num)==1)                        cout <<" 找到！" <<endl;           else            cout <<" 没有找到！" <<endl;           void wwjt();           wwjt();}void wwjt(){      int a[10]={54,256,563,754,34,56,345,543,45,65};                          fstream myfile;                myfile.open(" out.txt" ,ios::out);                myfile<<fun(a,46)<<endl;                myfile<<fun(a,345)<<endl;                myfile.close();}

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