[joebin]

#include<iostream>
using namespace std;
int main(){
  int s=0,n,m,i;  //s表總合,n表輸入的數字,m表要找的質數
   cout <<"please put in a num";
  cin >>n;
  if(n==1) cout <<"The sum is 0."<<endl;
  else{
    for(m=2;m<=n;m++)  //m由２到n
      for(i=2;i<=m;i++){
        if(m%i==0&&i!=m) break;  //當m不為質數時跳出
             if(i==m){
          cout <<m<<endl;  //m為質數,s+m=s
          s+=m;
        }
      }
  }
  cout <<"The sum is "<<s<<"."<<endl;
  system("pause");
  return 0;
}

還有The prime numbers between 1 and 100 are

這句有誤,應該是The prime numbers between 1 and 50 are