帮忙完善一下我的程序【c++吧】

设计要求：
(1)完善计算器程序，改为可对实数操作。
(2)完善程序，改为多个操作数基本四则运算，遇到0为止。
(3)增加函数，完成四则混合运算，增加相应的主菜单选项。
(4)添加语句，使四则运算具有测试功能。
(5)可扩充其功能。
#include <process.h>
#include <iostream.h>
#include <stdio.h>
#include <cmath>
template <class T>
class operate {
private:
T add(T x, T y);
T sub(T x, T y);
T div(T x, T y);
T mult(T x, T y);
T fartocel(T x);
T celtofar(T x);
T sqroot(T x);
T pow(T x, T y);
T log(T x);
public:
T number1,number2,answer,val;
void calcadd();
void calcsub();
void calcdiv();
void calcmult();
void calcfartocel();
void calcceltofar();
void calcsroot();
void calcpow();
void calclog();
void menu();
};
template<class T> T operate<T>::add(T x, T y)
{
val = x + y;
return val;
}
template<class T>T operate<T>::sub(T x, T y)
{
val = x - y;
return val;
}
template<class T>T operate<T>::div(T x, T y)
{
     val = x / y;
    return val;
}
template<class T>T operate<T>::mult(T x, T y)
{
    val = x * y;
    return val;
}
template<class T>T operate<T>::fartocel(T x)
{
T cel;
cel = ((x - 32) * 5) / 9;
return cel;
}
template<class T>T operate<T>::celtofar(T x)
{
T f;
f = x * 9 / 5 + 32;
return f;
}
template<class T>T operate<T>::sqroot(T x)
{
T g;
g = sqrt(x);
return g;
}
template<class T>T operate<T>::pow(T x, T y)
{
T h;
h = pow(x,y);
return h;
}
template<class T>T operate<T>::log(T x)
{
T k;
k = log(x);
return k;
}
template<class T>void operate<T>::calcadd()
{
cout << "The Add Function\n";
cout << "First number: ";
cin >> number1;
cout << "Second number: ";
cin >> number2;
answer = add(number1,number2);
cout << number1 << " + " << number2 << " = " << answer << endl;
}
template<class T>void operate<T>::calcsub()
{
cout << "The Subtract Function\n";
cout << "First number: ";
cin >> number1;
cout << "Second number: ";
cin >> number2;
answer = sub(number1,number2);
cout << number1 << " - " << number2 << " = " << answer << endl;
}
template<class T>void operate<T>::calcdiv()
{
cout << "The Divide Function\n";
cout << "First number: ";
cin >> number1;
cout << "Second number: ";
cin >> number2;
answer = div(number1,number2);
cout << number1 << " / " << number2 << " = " << answer << endl;
}
template<class T>void operate<T>::calcmult()
{
cout << "The Multiply Function\n";

cout << "First number: ";
cin >> number1;
cout << "Second number: ";
cin >> number2;
answer = mult(number1,number2);
cout << number1 << " x " << number2 << " = " << answer << endl;
}
template<class T>void operate<T>::calcfartocel()
{
cout << "The Farenheit to Celsius Function\n";
cout << "Enter a tempature in Farenheit: ";
cin >> number1;
answer = fartocel(number1);
cout << "The tempature in Celsius is " << answer << endl;
}
template<class T>void operate<T>::calcceltofar()
{
cout << "The Celsius to Farenheit Function\n";
cout << "Enter a tempature in Celsius: ";
cin >> number1;
answer = celtofar(number1);
cout << "The tempature in Farenheit is " << answer << endl;
}
template<class T>void operate<T>::calcsroot()
{
cout << "The Square Root Function\n";
cout << "First number: ";
cin >> number1;
answer = sqroot(number1);
cout << "The square root of " << number1 << " is " << answer << endl;
}
template<class T>void operate<T>::calcpow()
{
cout<<"The Exponent Function\n";
cout<<"First number:";
cin>>number1;
cout<<"Second number:";
cin>>number2;
answer = pow(number1,number2);
cout << "The exponent is: " << answer << endl;
}
template<class T>void operate<T>::calclog()
{
cout << "The Logarithm Function\n";
cout << "First number: ";
cin >> number1;
answer = log(number1);
cout << "The logarithm is: " << answer << endl;
}
template<class T>void operate<T>::menu()
{
char input;
operate a;
cout << "==================MENU===============\n";
cout << "1: Add two numbers\n";
cout << "2: Subtract two numbers\n";
cout << "3: Divide two numbers\n";
cout << "4: Multiply two numbers\n";
cout << "5: Convert Farenheit to Celsius\n";
cout << "6: Convert Celsius to Farenheit\n";
cout << "7: Find the square root of a number\n";
cout <<"8:The Exponent Function\n";
cout <<"9:The Logarithm Function\n";
cout << "Choice: ";
cin >> input;
cout << "=====================================\n";
switch (input)
{
case '1':      a.calcadd();
break;
case '2':     a.calcsub();
break;
case '3':     a.calcdiv();
break;
case '4':     a.calcmult();
break;
case '5':     a.calcfartocel();
break;
case '6':     a.calcceltofar();
break;
case '7':     a.calcsroot();
break;
case '8':    a.calcpow();
break;
case '9':    a.calclog();
break;
default:menu();
}
}
void main()
{
operate<double> s;
s.menu();
}

呵呵

哈哈

template<class T> T operate<T>::add(T x, T y)
{
val = x + y;
return val;
}
神马情况？

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帮忙完善一下我的程序

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