（百例编程）44.分数之合

#include <iostream>
using namespace std;

int main(void)
{
for (int p = 1; p != 5;++p)
for(int q = p; q != 7;++q)
for(int r = q; r != 13; ++r)
for(int s = r; s != 13; ++s)
{
if (q*r*s+p*r*s+p*q*s+p*q*r == p*q*r*s)
{
cout<<"p:"<<p<<" "
<<"q:"<<q<<" "
<<"r:"<<r<<" "
<<"s:"<<s<<endl;
}
}
return 1;
}