1-1000内即是3的倍数，又是5的倍数的算法流程图

#include <iostream>
using namespace std;

bool Three(int a)
{
    if(a%3==0)
        return true;
    else return false;
}

bool Five(int a)
{
    if(a%5==0)
        return true;
    else return false;
}

void main()
{
    int s;
    for(s = 1; s <= 1000; s++)
    {
        if(Three(s)&&Five(s))
            cout<<s<<"  ";
    }
}