好的，我有很多else if陳述句，有沒有辦法將它們壓縮成更少的代碼行？就像為所有這些做一個 if 陳述句？有什么方法可以讓我的代碼更優化、更容易閱讀？
int x;
int y;
int time=0;
Random rng = new Random();
int hrand_num = rng.Next(-24000, 24000);
int vrand_num = rng.Next(-24000, 24000);
x = hrand_num;
y = vrand_num;
while (true)
{
ConsoleKey key = Console.ReadKey().Key;
if (key == ConsoleKey.UpArrow)
{
y=y 2000;
}
else if (key == ConsoleKey.DownArrow)
{
y=y-2000;
}
else if (key == ConsoleKey.LeftArrow)
{
x = x-1000;
}
else if (key == ConsoleKey.RightArrow)
{
x = x 1000;
}
// Circumnavigate Players Position.
// North and South
if (y >= 24001)
{
y = -24000;
}
else if (y <= -24001)
{
y = 24000;
}
//West and East
else if (x >= 24001)
{
x = -24000;
}
else if (x <= -24001)
{
x = 24000;
}
// Setting Time Zones
if (x >= -2000 && x <= 0 )
{
time = 0;
}
else if (x >=
1 && x <= 2000)
{
time = 1;
}
else if (x >= 2001 && x <=4000)
{
time = 2;
}
else if (x >= 4001 && x <= 6000)
{
time = 3;
}
else if (x >= 6001 && x <= 8000)
{
time = 4;
}
else if (x >= 8001 && x <= 10000)
{
time = 5;
}
else if (x >= 10001 && x <= 12000)
{
time = 6;
}
else if (x >= 12001 && x <= 14000)
{
time = 7;
}
else if (x >= 14001 && x <= 16000)
{
time = 8;
}
else if (x >= 16001 && x <= 18000)
{
time = 9;
}
else if (x >= 18001 && x <= 20000)
{
time = 10;
}
else if (x >= 20001 && x <= 22000)
{
time = 11;
}
else if (x >= 22001 && x <= 24000)
{
time = 12;
}
else if (x == -24000 && x <= -22001)
{
time = 13;
}
else if (x >= -22000 && x <= -20001 )
{
time = 14;
}
else if (x >= -20000 && x <= -18001)
{
time = 15;
}
else if (x >= -18000 && x <= -16001)
{
time = 16;
}
else if (x >= -16000 && x <= -14001)
{
time = 17;
}
else if (x >= -14000 && x <= -12001)
{
time = 18;
}
else if (x >= -12000 && x <= -10001)
{
time = 19;
}
else if (x >= -10000 && x <= -8001)
{
time = 20;
}
else if (x >= -8000 && x <= -6001)
{
time = 21;
}
else if (x >= -6000 && x <= -4001)
{
time = 22;
}
else if (x >= -4000 && x <= -2001)
{
time = 23;
}
Console.WriteLine($"X: {x,6} Y: {y,6} Time: {time,3}");
}
```
uj5u.com熱心網友回復：
Assuming that you are using C# 8.0 you may have a look at the switch statement and switch expressions: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/operators/switch-expression (additionaly the patterns documentation is also helpful: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/operators/patterns)
So you could write something like:
switch (key)
{
case ConsoleKey.UpArrow:
y=y 2000;
break;
// [...]
}
time = x switch
{
>= -2000 and <= 0 => 0,
>= 1 and <= 2000 => 1
// [...]
};
uj5u.com熱心網友回復：
I would suggest that you take advantage of:
- a switch statement for interpreting the arrow key
- comparing the switch statement to an if loop, you can think of the first
caseas being theifcondition and the remaningcases as being theelse ifconditions
- comparing the switch statement to an if loop, you can think of the first
Math.Abs( )andMath.Sign( )for circumnavigating the player's positionMath.Abs( )returns the absolute value of the variable; e.g. willMath.Abs(x)return5both forx = 5andx = -5Math.Sign( )returns the sign of the value; if the value is a negative number, it returns-1; if it's a positive number, it returns1; if it's neither (0), it returns0. This helps us determine the wanted sign of the updated value.
- a switch expression for setting the
time- seeing as the
timevalue alone is determined byxin the end, you can use a switch expression rather than a switch statement to determine its value. The switch expression says that you want to determine the value oftimebased on the value ofx; and each following condition is compared tox(<= -22001is computed asx <= -22001). If the condition evaluates totrue, the provided value is set as the value oftime(=> 13then setstime = 13).
- seeing as the
It could be implemented like this:
int x;
int y;
Random rng = new Random();
int hrand_num = rng.Next(-24000, 24000);
int vrand_num = rng.Next(-24000, 24000);
x = hrand_num;
y = vrand_num;
while (true)
{
switch (Console.ReadKey().Key)
{
case ConsoleKey.UpArrow:
y = 2000;
break;
case ConsoleKey.DownArrow:
y -= 2000;
break;
case ConsoleKey.LeftArrow:
x -= 1000;
break;
case ConsoleKey.RightArrow:
x = 1000;
break;
}
// Circumnavigate Players Position.
// North and South
if (Math.Abs(y) > 24000)
{
y = -(Math.Sign(y) * 24000);
}
//West and East
else if (Math.Abs(x) > 24000)
{
x = -(Math.Sign(x) * 24000);
}
// Setting Time Zones
var time = x switch
{
<= -22001 => 13,
<= -20001 => 14,
<= -18001 => 15,
<= -16001 => 16,
<= -14001 => 17,
<= -12001 => 18,
<= -10001 => 19,
<= -8001 => 20,
<= -6001 => 21,
<= -4001 => 22,
<= -2001 => 23,
<= 0 => 0,
<= 2000 => 1,
<= 4000 => 2,
<= 6000 => 3,
<= 8000 => 4,
<= 10000 => 5,
<= 12000 => 6,
<= 14000 => 7,
<= 16000 => 8,
<= 18000 => 9,
<= 20000 => 10,
<= 22000 => 11,
<= 24000 => 12,
_ => 0
};
Console.WriteLine($"X: {x,6} Y: {y,6} Time: {time,3}");
I would also suggest introducing some constants; particularily for the value 24000.
uj5u.com熱心網友回復：
You can use the following to cover all time cases
var time = x <= 24000
? x / 2000 1;
: (24000 - x) / 2000 13;
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