// function example<br /> #include <iostream><br /> using namespace std;</p> <p>int addition (int a, int b)<br /> {<br /> int r;<br /> r=a+b;<br /> return r;<br /> }

#include<iostream><br /> using namespace std;</p> <p>void square(int value)<br /> {<br /> int total = pow(value, 2);<br /> cout << total << endl;<br /> }</p> <p>void cube(int value)<br /> {<br /> int total = pow(value, 3);<br /> cout << total << endl;<br /> }</p> <p>int main()<br /> {<br /> int value;<br /> cout << “Enter value: “;<br /> cin >> value;</p> <p> if (value % 2 == 0)<br /> {<br /> square(value);<br /> }<br /> else<br /> {<br /> cube(value);<br /> }</p> <p> return 0;<br /> }

#include <iostream></p> <p>using namespace std;</p> <p>void function(){<br /> cout << “I am a function!” << endl;<br /> }</p> <p>int main()<br /> {<br /> function();</p> <p> return 0;<br /> }

void Hello() {<br /> std::cout << “Hello”;<br /> }</p> <p>int main () {<br /> Hello();<br /> }

// the void function<br /> void function() {<br /> cout << “Hello World!”;<br /> }</p> <p>// the main function<br /> int main() {<br /> function();<br /> return 0;<br /> }

//first lets create a function<br /> /*void is for starting something, anything after void will be the name of your<br /> function which will be followed by () */<br /> void yourFunction() {<br /> //your code will be here, anything here will be the code in the yourFunction<br /> cout << “Functions”<br /> }<br /> //now we have to go to our main function, the only function the compiler reads<br /> int main() {<br /> myFunction(); //you call the function, the code we put in it earlier will be executed<br /> return 0;<br /> }

#include <iostream><br /> using namespace std;</p> <p>// declaring a function<br /> void displayNum(int n1, float n2) {<br /> cout << “The int number is ” << n1;<br /> cout << “The double number is ” << n2;<br /> }</p> <p>int main() {<br /> int num1 = 5;<br /> double num2 = 5.5;</p> <p> // calling the function<br /> displayNum(num1, num2);<br /> return 0;<br /> }

// C++ Program to demonstrate working of a function<br /> #include <iostream><br /> using namespace std;<br />  <br /> // Following function that takes two parameters ‘x’ and ‘y’<br /> // as input and returns max of two input numbers<br /> int max(int x, int y)<br /> {<br />     if (x > y)<br />         return x;<br />     else<br />         return y;<br /> }<br />  <br /> // main function that doesn’t receive any parameter and<br /> // returns integer<br /> int main()<br /> {<br />     int a = 10, b = 20;<br />  <br />     // Calling above function to find max of ‘a’ and ‘b’<br />     int m = max(a, b);<br />  <br />     cout << “m is ” << m;<br />     return 0;<br /> }

return_type function_name( parameter list ) {<br /> body of the function<br /> }<br />