%.5f at %.2f %.2f %.2f x %.2f
时间: 2024-04-11 12:32:36 浏览: 130
这是一个简单计算器的程序。它可以通过输入格式"%f%c%f"来计算表达式"data1 op data2"的值,其中op是加减乘除运算符。程序会输出结果,例如"%.2f+%.2f=%.2f\n"用于输出加法运算的结果。如果除数为0,则程序会输出"division by zero\n",如果运算符不正确,则程序会输出"unknown operator.\n"。
相关问题
printf(“f(%f)=%.2f)"
这是一个 C 语言中的 printf 函数的调用,它的作用是将一个浮点数格式化为一个字符串并打印出来。其中,第一个 %f 表示要格式化的浮点数,而第二个 %.2f 表示要打印出来的浮点数的精度为两位小数。例如,如果要打印出 f=3.14159,那么调用这个函数的代码可能是:
```
float f = 3.14159;
printf("f(%.5f) = %.2f", f, f);
```
输出的字符串将会是:
```
f(3.14159) = 3.14
```
class JoystickControl(context: Context, attrs: AttributeSet?) : View(context, attrs) { private val paint = Paint(Paint.ANTI_ALIAS_FLAG) private var centerX = 0f private var centerY = 0f private var radius = 0f private var thumbX = 0f private var thumbY = 0f private var onJoystickChangeListener: OnJoystickChangeListener? = null interface OnJoystickChangeListener { fun onJoystickChanged(thumbX: Float, thumbY: Float) } fun setOnJoystickChangeListener(listener: OnJoystickChangeListener) { onJoystickChangeListener = listener } override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) { centerX = w / 2f centerY = h / 2f radius = min(w, h) / 2f * 0.8f } override fun onDraw(canvas: Canvas) { paint.color = Color.GRAY canvas.drawCircle(centerX, centerY, radius, paint) paint.color = Color.RED val thumbRadius = radius / 5f canvas.drawCircle(thumbX + centerX, thumbY + centerY, thumbRadius, paint) } override fun onTouchEvent(event: MotionEvent): Boolean { when (event.action) { MotionEvent.ACTION_DOWN, MotionEvent.ACTION_MOVE -> { val distance = sqrt((event.x - centerX) * (event.x - centerX) +(event.y - centerY) * (event.y - centerY)) if (distance < radius) { thumbX = event.x - centerX thumbY = event.y - centerY invalidate() onJoystickChangeListener?.onJoystickChanged(thumbX, thumbY) } else { val angle = atan2(event.y - centerY, event.x - centerX) thumbX = cos(angle) * radius thumbY = sin(angle) * radius invalidate() onJoystickChangeListener?.onJoystickChanged(thumbX, thumbY) } } MotionEvent.ACTION_UP -> { thumbX = 0f thumbY = 0f invalidate() onJoystickChangeListener?.onJoystickChanged(thumbX, thumbY) } } return true } }我想加入传递游戏手柄参数的代码
你可以在OnJoystickChangeListener接口中添加一个新的方法,用于传递手柄参数,如下所示:
```kotlin
interface OnJoystickChangeListener {
fun onJoystickChanged(thumbX: Float, thumbY: Float)
fun onJoystickParamsChanged(params: String)
}
```
然后,你可以在onTouchEvent方法中获取手柄参数,并且在onJoystickParamsChanged方法中将其传递给监听器:
```kotlin
override fun onTouchEvent(event: MotionEvent): Boolean {
when (event.action) {
MotionEvent.ACTION_DOWN, MotionEvent.ACTION_MOVE -> {
val distance = sqrt((event.x - centerX) * (event.x - centerX) +
(event.y - centerY) * (event.y - centerY))
if (distance < radius) {
thumbX = event.x - centerX
thumbY = event.y - centerY
invalidate()
// Pass joystick position and parameters to listener
onJoystickChangeListener?.onJoystickChanged(thumbX, thumbY)
onJoystickChangeListener?.onJoystickParamsChanged("PARAMS")
} else {
val angle = atan2(event.y - centerY, event.x - centerX)
thumbX = cos(angle) * radius
thumbY = sin(angle) * radius
invalidate()
// Pass joystick position and parameters to listener
onJoystickChangeListener?.onJoystickChanged(thumbX, thumbY)
onJoystickChangeListener?.onJoystickParamsChanged("PARAMS")
}
}
MotionEvent.ACTION_UP -> {
thumbX = 0f
thumbY = 0f
invalidate()
// Pass joystick position and parameters to listener
onJoystickChangeListener?.onJoystickChanged(thumbX, thumbY)
onJoystickChangeListener?.onJoystickParamsChanged("PARAMS")
}
}
return true
}
```
请注意,我在此处将参数设置为“PARAMS”,你需要将其替换为你想要传递的实际参数。
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