Dxライブラリでポーカーゲームを作っています。

Question

僕は現在DXライブラリでポーカーゲームを作っています。
質問というより疑問なのですがポーカーの大事な手札入れ替えの書き方がわからない状態です。
今のイメージはランダムにひょうじされた５枚のトランプの画像をマウスで選択し、エンターキーを押されたのを確認したら選択した画像がランダムで別のものに入れ替えられるといったものです。
どのようにしたらいいですか？
まだまだ序盤ですがソースを載せておきます。```C++
#include "DxLib.h"

int card_Graphic[52];

void load() {
card_Graphic[0] = LoadGraph("Card\A-1.png");
card_Graphic[1] = LoadGraph("Card\A-2.png");
card_Graphic[2] = LoadGraph("Card\A-3.png");
card_Graphic[3] = LoadGraph("Card\A-4.png");
card_Graphic[4] = LoadGraph("Card\A-5.png");
card_Graphic[5] = LoadGraph("Card\A-6.png");
card_Graphic[6] = LoadGraph("Card\A-7.png");
card_Graphic[7] = LoadGraph("Card\A-8.png");
card_Graphic[8] = LoadGraph("Card\A-9.png");
card_Graphic[9] = LoadGraph("Card\A-10.png");
card_Graphic[10] = LoadGraph("Card\A-11.png");
card_Graphic[11] = LoadGraph("Card\A-12.png");
card_Graphic[12] = LoadGraph("Card\A-13.png");
card_Graphic[13] = LoadGraph("Card\B-1.png");
card_Graphic[14] = LoadGraph("Card\B-2.png");
card_Graphic[15] = LoadGraph("Card\B-3.png");
card_Graphic[16] = LoadGraph("Card\B-4.png");
card_Graphic[17] = LoadGraph("Card\B-5.png");
card_Graphic[18] = LoadGraph("Card\B-6.png");
card_Graphic[19] = LoadGraph("Card\B-7.png");
card_Graphic[20] = LoadGraph("Card\B-8.png");
card_Graphic[21] = LoadGraph("Card\B-9.png");
card_Graphic[22] = LoadGraph("Card\B-10.png");
card_Graphic[23] = LoadGraph("Card\B-11.png");
card_Graphic[24] = LoadGraph("Card\B-12.png");
card_Graphic[25] = LoadGraph("Card\B-13.png");
card_Graphic[26] = LoadGraph("Card\C-1.png");
card_Graphic[27] = LoadGraph("Card\C-2.png");
card_Graphic[28] = LoadGraph("Card\C-3.png");
card_Graphic[29] = LoadGraph("Card\C-4.png");
card_Graphic[30] = LoadGraph("Card\C-5.png");
card_Graphic[31] = LoadGraph("Card\C-6.png");
card_Graphic[32] = LoadGraph("Card\C-7.png");
card_Graphic[33] = LoadGraph("Card\C-8.png");
card_Graphic[34] = LoadGraph("Card\C-9.png");
card_Graphic[35] = LoadGraph("Card\C-10.png");
card_Graphic[36] = LoadGraph("Card\C-11.png");
card_Graphic[37] = LoadGraph("Card\C-12.png");
card_Graphic[38] = LoadGraph("Card\C-13.png");
card_Graphic[39] = LoadGraph("Card\D-1.png");
card_Graphic[40] = LoadGraph("Card\D-2.png");
card_Graphic[41] = LoadGraph("Card\D-3.png");
card_Graphic[42] = LoadGraph("Card\D-4.png");
card_Graphic[43] = LoadGraph("Card\D-5.png");
card_Graphic[44] = LoadGraph("Card\D-6.png");
card_Graphic[45] = LoadGraph("Card\D-7.png");
card_Graphic[46] = LoadGraph("Card\D-8.png");
card_Graphic[47] = LoadGraph("Card\D-9.png");
card_Graphic[48] = LoadGraph("Card\D-10.png");
card_Graphic[49] = LoadGraph("Card\D-11.png");
card_Graphic[50] = LoadGraph("Card\D-12.png");
card_Graphic[51] = LoadGraph("Card\D-13.png");

}

int WINAPI WinMain(HINSTANCE hI, HINSTANCE hP, LPSTR lpC, int nC)
{
ChangeWindowMode(TRUE), DxLib_Init();

int ura;
ura = LoadGraph("Card\ura.png");


int haikei, Mouse, mozi1, mozi2;
mozi1 = CreateFontToHandle("ＭＳ ゴシック", 50, 9, DX_FONTTYPE_NORMAL);
mozi2 = CreateFontToHandle("ＭＳ ゴシック", 30, 7, DX_FONTTYPE_NORMAL);
haikei = LoadGraph("haikei.jpg");

DrawRotaGraph(320, 240, 0.5, 0.0, haikei, TRUE);
DrawFormatString(25, 220, GetColor(255, 255, 255), "1P");
DrawFormatString(25, 370, GetColor(255, 255, 255), "2P");

while (1){
	 
	ProcessMessage();
	DrawStringToHandle(100, 70, "ポーカーゲーム開始。", GetColor(255, 255, 255), mozi1);
	Mouse = GetMouseInput();
	if (Mouse & MOUSE_INPUT_LEFT) {
		break;
	}
}



DrawStringToHandle(60, 75, "[1P]交換するカードを選んでください", GetColor(255, 255, 255), mozi2);
	
	load();

	DrawRotaGraph(110, 220, 0.125, 0.0 , card_Graphic[GetRand(51)] , TRUE);
	DrawRotaGraph(220, 220, 0.125, 0.0, card_Graphic[GetRand(51)], TRUE);
	DrawRotaGraph(330, 220, 0.125, 0.0, card_Graphic[GetRand(51)], TRUE);
	DrawRotaGraph(440, 220, 0.125, 0.0, card_Graphic[GetRand(51)], TRUE);
	DrawRotaGraph(550, 220, 0.125, 0.0, card_Graphic[GetRand(51)], TRUE);

	Mouse& MOUSE_INPUT_LEFT;

	DrawRotaGraph(110, 370, 0.125, 0.0, ura, TRUE);
	DrawRotaGraph(220, 370, 0.125, 0.0, ura, TRUE);
	DrawRotaGraph(330, 370, 0.125, 0.0, ura, TRUE);
	DrawRotaGraph(440, 370, 0.125, 0.0, ura, TRUE);
	DrawRotaGraph(550, 370, 0.125, 0.0, ura, TRUE);

	

	
	
	WaitKey();
		
DxLib_End();				

return 0;				

}