A simple program to ask the user to give three numbers and then the program will compute the sum of three numbers using a function in C++ programming language.

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Program Listing
#include <iostream>

using namespace std;

int add_three_numbers(int x, int y, int c)

int main(){
   int a=0,b=0,c=0;
   int sum=0;

   cout <<"\n\n";
   cout << "\tAddition of Three Numbers Using Functions in C++";
   cout <<"\n\n";
   cout << "\tEnter Three Numbers : ";
   cin >> a >> b >> c;
   sum = add_three_numbers(a,b,c);
   cout <<"\n\n";
   cout << "\tThe sum of " << a << ", " << b << " and "
        << c << " is " << sum << ".";
   cout <<"\n\n";
   cout <<"\tEnd of Program";
   cout <<"\n\n";