C++ Program to find Sum of Array using function template

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Templates are the foundation of generic programming, which involves writing code in a way that is independent of any particular type.

A template is a blueprint or formula for creating a generic class or a function. The library containers like iterators and algorithms are examples of generic programming and have been developed using template concept.

There is a single definition of each container, such as vector, but we can define many different kinds of vectors for example, vector <int> or vector <string>..

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Function Template :

The general form of a template function definition is shown here:

template <class type> ret-type func-name(parameter list)

{
// body of function
}

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Class Template :

Just as we can define function templates, we can also define class templates. The general form of a generic class declaration is shown here:

template <class type> class class-name

{
.
.
.
}

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Below is the source code for C++ Program to find Sum of Array using function template which is successfully compiled and run on Windows System to produce desired output as shown below :

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SOURCE CODE : :

/*  C++ Program to find Sum of Array using function template  */

#include <iostream>

using namespace std;


template<class T> T sum(T a[], int length)
{
        T ret = a[0];
        for (int i = 1; i < length; i ++)
                ret += a[i];

        return ret;
}

int main(void) {
        int int_data[5];
        float float_data[5];
        int i = 0;

        // input 5 integers
        cout << "\nInput 5 integers :: \n" << endl;
        for (; i < 5; i++)
                cin >> int_data[i];
        // print sum of 5 integers
        cout << "\nSum of above is :: " << sum(int_data, 5) << endl;

        // input 5 float numbers
        cout << "\nInput 5 floats :: \n" << endl;
        for (i = 0; i < 5; i ++)
                cin >> float_data[i];
        // print sum of 5 float numbers
        cout << "\nSum of above is :: " << sum(float_data, 5) << endl;

        cin.get();
        return 0;
}

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OUTPUT : :

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/*  C++ Program to find Sum of Array using function template  */

Input 5 integers ::

1
2
3
4
5

Sum of above is :: 15

Input 5 floats ::

1.3
2.3
3.5
4.3
2.1

Sum of above is :: 13.5

Process returned 0

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Above is the source code and output for C++ Program to find Sum of Array using function template which is successfully compiled and run on Windows System to produce desired output.

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