please extend this coding into array or into more functions like trigonomentry and scientifc functions

Question

please help me out :(
#include<iostream>
using namespace std;
class Calculator
{

private:
int no1,no2;
char ch;
public:
int get_data()
{
cout<<"enter 1st No & 2nd No:"<<endl;
cin>>no1>>no2;
cout<<"enter a operation:"<<endl;
cin>>ch;
}
int display_data()
{
if(ch=='+')
cout<<"Sum is:"<<no1+no2;
else if(ch=='-')
cout<<"Diff is:"<<no1-no2;
else if(ch=='*')
cout<<"Multiplay is:"<<no1*no2;
else if(ch=='/')
cout<<"Quotient is:"<<no1/no2;
else if(ch=='%')
cout<<"Remainder is:"<<no1%no2;
else
cout<<"invalid operation:";
}
};
int main()
{Calculator C;
C.get_data();
C.display_data();
return (0);
}

Answer 1

use the inbuilt mathematics functions to do that .
Like
acos();
sin();
tan();
log();
log_10();
pow();
sqrt();
etc ..