c++ function definition code example

Example 1: how to declare a function in c++

// function example
#include <iostream>
using namespace std;

int addition (int a, int b)
{
  int r;
  r=a+b;
  return r;
}

Example 2: function in c++

#include <iostream>

using namespace std;

void function(){
    cout << "I am a function!" << endl;
}

int main()
{
    function();

    return 0;
}

Example 3: functions in C++

void Hello() {
  std::cout << "Hello";
}

int main () {
  Hello();
}

Example 4: function declerations in C++

#include <iostream>
#include <stdlib.h>
#include <iomanip>
#include <fstream>
using namespace std;

void function_one(double, double, double);

int main() {
  double r1 = 1.0;
  double r2 = 2.0;
  double x = 0.0;
  function_one(r1, r2, x);
  return 0;
}

void function_one(double rmin, double rmax, double x0) {
  cout << "Function got called" << endl;
}

Example 5: how to make a function in cpp

// function returning the max between two numbers
 
int max(int num1, int num2) {
   // local variable declaration
   int result;
 
   if (num1 > num2)
      result = num1;
   else
      result = num2;
 
   return result; 
}