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C++ program to add different items with class templates
Suppose we want to make a class that can add two integers, two floats and two strings (string addition is basically concatenating strings). As input at first we take a number n represents there are n different operations. In each operation the first item is the type [int, float, string] and second and third are two operands. So each line will contain three elements. We shall have to read them and do the operations as mentioned.
So, if the input is like
5 int 5 7 int 6 9 float 5.25 9.63 string hello world string love C++
then the output will be
12 15 14.88 helloworld loveC++
To solve this, we will follow these steps −
Define a class called AddItems with class template. It has two functions add() and concatenate(). add() will add integers and floats, and concatenate() will concatenate strings.
From the main method, do the following
for initialize i := 0, when i < n, update (increase i by 1), do:
type := current type
if type is same as "float", then:
take two operands e1 and e2
create an object of AddItems of type float called myfloat with item e1
call myfloat.add(e2) and display
otherwise when type is same as "int", then:
take two operands e1 and e2
create an object of AddItems of type float called myint with item e1
call myint.add(e2) and display
otherwise when type is same as "string", then:
take two operands e1 and e2
create an object of AddItems of type float called mystring with item e1
call mystring.concatenate(e2) and display
Example
Let us see the following implementation to get better understanding −
#include <iostream>
using namespace std;
template <class T>
class AddItems {
T element;
public:
AddItems (T arg) {
element=arg;
}
T add (T e2) {
return element+e2;
}
T concatenate (T e2) {
return element+e2;
}
};
int main(){
int n,i;
cin >> n;
for(i=0;i<n;i++) {
string type;
cin >> type;
if(type=="float") {
float e1,e2;
cin >> e1 >> e2;
AddItems<float> myfloat (e1);
cout << myfloat.add(e2) << endl;
}
else if(type == "int") {
int e1, e2;
cin >> e1 >> e2;
AddItems<int> myint (e1);
cout << myint.add(e2) << endl;
}
else if(type == "string") {
string e1, e2;
cin >> e1 >> e2;
AddItems<string> mystring (e1);
cout << mystring.concatenate(e2) << endl;
}
}
}
Input
5 int 5 7 int 6 9 float 5.25 9.63 string hello world string love C++
Output
12 15 14.88 helloworld loveC++
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