[C++ ] 8

[jasonfghx (工人)]

功能

用到的觀念

CODE
#include<iostream>//header file
#include<iomanip>
#include<cmath>
using namespace std;
using std::setw;
using std::fixed;
using std::setprecision;
#include<string>
using std::string;
using std::getline;
int hcf(int, int);
int main()
{
    unsigned n;//n save the number of the end,
        int i,j,m=0;//declare the number for the loop
 cout<<"enter a number"<<endl;
        cin>>n;//輸入存到n
        if(n==2)//check whether n is equal to 2
        {
                cout<<"2";//顯示內容
        }
        if(n==3)//check whether n is equal to 3
        {
                cout<<"2"<<endl;//顯示內容
                cout<<"3"<<endl;//顯示內容
        }
        if(n>3)
        {
                cout<<"2 "<<endl;//顯示內容
                cout<<"3 "<<endl;//顯示內容
                for(i = 2; i<=n;i++)//從2檢查到n判斷是否為質數
                {
              for(j=2;j<i-1;j++)
              {
               if(i%j==0)
               {
                m=1;
                break;
               }
               else
               {
                m=2;
               }
              }
               if(m==2)
               cout<<i<<endl;
        }
  }
        system("pause");
        return 0;
}

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