邏輯運算子

Console.WriteLine("{0}", true);
Console.WriteLine("{0}", !true);
Console.WriteLine("{0}", true == true);
Console.WriteLine("{0}", true == flase);
Console.WriteLine("{0}", true != false);
Console.WriteLine("{0}", true && false);
Console.WriteLine("{0}", true || false);
Console.WriteLine("{0}", true ^ false);
Console.WriteLine("{0}", false ^ false);
					

邏輯運算子

Console.WriteLine("{0}", 1 == 1);
Console.WriteLine("{0}", 1 != 2);
Console.WriteLine("{0}", 1 < 2);
Console.WriteLine("{0}", 1 <= 1);
Console.WriteLine("{0}", 1 > 2);
Console.WriteLine("{0}", 1 >= 2);
Console.WriteLine("{0}", 1+1 == 2);
Console.WriteLine("{0}", 1+1 > 2);
					

if

如果

if(條件)
{
	//條件為真則會做
}

					

if

bool isGirl = true;
Console.WriteLine("Line1");
if(isGirl)
{
	Console.WriteLine("She is a girl: {0}", isGirl);
}
Console.WriteLine("Line2 or line3?");
					

if、else

如果、其餘

if(條件)
{
	//條件為真則會做
}
else
{
	//其餘的會做
}

if、else

bool isGirl = false;
Console.WriteLine("Line1");
if(isGirl)
{
	Console.WriteLine("She is a girl: {0}", isGirl);
}
else
{
	Console.WriteLine("She isn't a girl: {0}", isGirl);
}
Console.WriteLine("Line2, line3 or line4?");
					

if、else if、else

如果、其餘之中如果、其餘

if(條件一)
{
	//條件一為真則會做
}
else if(條件二)
{
	//條件一不為真但條件二為真則會做
}
...
else
{
	//其餘的
}

if、else if、else

int score = 83;
Console.WriteLine("Line1");
if(score == 100)
{
	Console.WriteLine("Excellent!");
}
else if(score >= 90)
{
	Console.WriteLine("Great!");
}
else if(score >= 70)
{
	Console.WriteLine("Not bad!");
}
else if(score >= 60)
{
	Console.WriteLine("Fine");
}
else
{
	Console.WriteLine("Bad...");
}
Console.WriteLine("The score: {0}", score);
					

練習

執行結果？

bool isBoy = true;
bool isCute = true;
if(isBoy)
{
	if(isCute)
	{
		Console.Write("這麼可愛一定是男孩子！");
	}
	else
	{
		Console.WriteLine("唉呀，是個小正太~");
	}
}
else
{
	if(isCute)
	{
		Console.WriteLine("是ㄌㄌ！");
	}
	else
	{
		Console.WriteLine("成熟性感美麗的大姊姊>/////<");
	}
}
					

亂數

Random rd1 = new Random();
Random rd2 = new Random();

Console.WriteLine("First: {0}, {1}, {2}, {3}", rd1.Next(), rd1.Next(), rd1.Next(), rd1.Next());
Console.WriteLine("Second: {0}, {1}, {2}, {3}", rd2.Next(), rd2.Next(), rd2.Next(), rd2.Next());
					

亂數

Random rd1 = new Random(Guid.NewGuid().GetHashCode());
Random rd2 = new Random(Guid.NewGuid().GetHashCode());

Console.WriteLine("First: {0}, {1}, {2}, {3}", rd1.Next(), rd1.Next(), rd1.Next(), rd1.Next());
Console.WriteLine("Second: {0}, {1}, {2}, {3}", rd2.Next(), rd2.Next(), rd2.Next(), rd2.Next());

Console.WriteLine("First: {0}, {1}, {2}, {3}", rd1.Next(3), rd1.Next(3), rd1.Next(3), rd1.Next(3));
Console.WriteLine("Second: {0}, {1}, {2}, {3}", rd2.Next(4, 6), rd2.Next(4, 6), rd2.Next(4, 6), rd2.Next(4, 6));