в 15:31, 26 мая 2010

2010-05-26T15:31:02Z

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2010-05-26T12:05:55Z

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==param array parameter==

<source lang="csharp">
#include "stdafx.h"
using namespace System;
int Total( int a, ... array<int>^ varargs)
{
int tot = a;
for each ( int i in varargs)
{
tot += i;
}
return tot;
}
int main()
{
int sum1 = Total(100, 200, 350);
Console::WriteLine("First total: {0}", sum1);
int sum2 = Total(1, 2, 3, 4, 5, 6, 7, 8);
Console::WriteLine("Second total: {0}", sum2);
}

</source>

==parameter passing==

<source lang="csharp">
#include "stdafx.h"
void byvalue(int i)
{
i += 1;
}
void byref(int& i)
{
i += 1;
}
int main()
{
int j = 10;
System::Console::WriteLine("Original value: " + j);
byvalue(j);
System::Console::WriteLine("After byvalue: " + j);
byref(j);
System::Console::WriteLine("After byref: " + j);
}

</source>

==pass by reference==

<source lang="csharp">
#include "stdafx.h"
using namespace System;
value class Pair
{
public:
int x;
int y;
};
void swap_values(Pair% pair)
{
int temp = pair.x;
pair.x = pair.y;
pair.y = temp;
}
int main()
{
Pair p;
p.x = 5;
p.y = 3;
Console::WriteLine("{0} {1}", p.x, p.y);
swap_values(p);
Console::WriteLine("{0} {1}", p.x, p.y);
}

</source>

==pass by value==

<source lang="csharp">
#include "stdafx.h"
using namespace System;
ref struct R
{
R()
{
val = 1;
}
// copy constructor
R( R% r)
{
val = r.val;
}
property int val;
};
void f(R r_local)
{
r_local.val = 2;
Console::WriteLine("Within f: " + r_local.val);
}
int main()
{
R r;
f(r);
Console::WriteLine("Outside f: " + r.val);
R^ rhat = gcnew R();
f(*rhat);
Console::WriteLine("Outside f: " + rhat->val);
}

</source>

==Passing array as parameter==

<source lang="csharp">
#include "stdafx.h"
using namespace System;
void set_to_one(int i, array<int>^ array_arg)
{
array_arg[i] = 1;
}
int main()
{
array<int>^ array1 = { 0, 1 };
set_to_one(0, array1);
Console::WriteLine(" {0} {1}", array1[0], array1[1]);
}

</source>

==Passing value struct to function==

<source lang="csharp">

#include "stdafx.h"
using namespace System;
value struct V
{
int a;
int b;
};
void f(V% v)
{
v.a = 10;
v.b = 20;
}
int main()
{
V v;
v.a = 1;
v.b = 2;
f(v);
Console::WriteLine("{0} {1}", v.a, v.b);
}

</source>

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Visual C++ .NET/Function/Function parameter - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия