function : passing by value

تربيع العدد:
#include "stdafx.h"
#include<iostream>
#include<conio.h>
using namespace std;
int sqr(int x)
{
return(x*x);
}
void main()
{
int n;
cout << "enter number ";
cin >> n;
cout << "the square of number is : " << sqr(n);
_getch();
}
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اختيار القيمة الاكبربين عددين:

#include "stdafx.h"
#include<iostream>
#include<conio.h>
using namespace std;
int max(int, int);
void main()
{
int m, n;
cout << "enter two number to found max : ";
cin >> m >> n;
cout << "the max number is : " << max(m, n)<<endl;
_getch();
}
int max(int x, int y)
{
if (x>y);
return x;
if (y>x)
return y;
}