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#include <iostream>
using namespace std;
//REMOVE COMMENTS TO USE VARIOUS FUNCTION CALLING METHODS
// function declaration
void swaper(int &,int&) ;// call by reference
//void swaper(int *,int * );// call by address
//void swaper(int,int );//call by value
int main () {
// local variable declaration:
int a = 100;
int b = 200;
/* calling a function to swap the values using variable reference.*/
swaper(a, b);// call by reference
//swaper(&a, &b); //call by address
//swaper(a, b); // call by value
cout << "After swap, value of a :" << a << endl;
cout << "After swap, value of b :" << b << endl;
return 0;
}
//CALL BY refernce DEFINATION
void swaper(int &x, int &y) // x and y are ref variable..ie they are other name for a and b
{
int temp;
temp = x; //save the value as x which is ref for a
x = y; // put y into x
y = temp; // put x into y
}
//CALL BY ADD DEFINATION
/*void swaper(int *x, int *y) {
int temp;
temp = *x; //save the value at address x
*x = *y; // put y into x
*y = temp; // put x into y
*/
// CALL BY VALUE DEFINATION
/* void swaper(int x, int y) {
int temp;
temp = x; // save the value of local x
x = y; // put local y into local x
y = temp; //put local x into local y
*/
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// C++ Program to demonstrate working of a function
#include <iostream>
using namespace std;
// Following function that takes two parameters 'x' and 'y'
// as input and returns max of two input numbers
int max(int x, int y)
{
if (x > y)
return x;
else
return y;
}
// main function that doesn't receive any parameter and
// returns integer
int main()
{
int a = 10, b = 20;
// Calling above function to find max of 'a' and 'b'
int m = max(a, b);
cout << "m is " << m;
return 0;
}