function declerations in c 2b 2b

1// function example
2#include <iostream>
3using namespace std;
4
5int addition (int a, int b)
6{
7  int r;
8  r=a+b;
9  return r;
10}

1#include <iostream>
2#include <stdlib.h>
3#include <iomanip>
4#include <fstream>
5using namespace std;
6
7void function_one(double, double, double);
8
9int main() {
10  double r1 = 1.0;
11  double r2 = 2.0;
12  double x = 0.0;
13  function_one(r1, r2, x);
14  return 0;
15}
16
17void function_one(double rmin, double rmax, double x0) {
18  cout << "Function got called" << endl;
19}