3.12

 #include <iostream>using namespace std;template<class numtype>class Compare{ public: Compare(numtype a,numtype b); numtype max(); numtype min(); private: numtype x,y;};template<class numtype>Compare<numtype>::Compare(numtype a,numtype b){ x=a; y=b;}template<class numtype>numtype Compare<numtype>::max(){return (x>y)?x:y;}template<class numtype>numtype Compare<numtype>::min(){    return (x<y)?x:y;}int main(){Compare<int> cmp1(3,7);cout<<cmp1.max()<<"is the Maximum of two integer numbers."<<endl;cout<<cmp1.min()<<"is the Minimum of two integer numbers."<<endl;Compare<float> cmp2(45.78,93.6);cout<<cmp2.max()<<"is the Maximum of two integer numbers."<<endl;cout<<cmp2.min()<<"is the Minimum of two integer numbers."<<endl;Compare<char> cmp3('a','A');cout<<cmp3.max()<<"is the Maximum of two characters."<<endl;cout<<cmp3.min()<<"is the Minimum of two characters."<<endl;}