sata multiplier

Str_repeat (PHP 4, PHP 5, PHP 7) Str_repeat-repeat a string str_repeat-repeating a string Descriptionstr_repeat($input,$multiplier)//Returns input repeated multiplier times.//返回 input 重复 multiplier 次后的结果。Parametersinput The string to is repeated. The string to be manipulated.

) Result = to * result + element; return result; } See here then you may have the same doubts as me, why is it? why the Hashcode method selects the number 31 as the multiplier This number is not a constant declaration, so it is impossible to infer the use of this number literally. Then with doubt and curiosity, go to the Internet to find information to inquire. After reading the material, silently sigh a sentence, the origina

= "!"Let Character2:character = "?"Let Stringpluscharacter = string1 + character1//equals "hello!"Let stringplusstring = string1 + string2//equals "Hello there"Let characterplusstring = character1 + string1//equals "!hello"Let Characterpluscharacter = Character1 + character2//equals "!?"You can also add a string or character to an already existing string variable by using the addition assignment operator (+ =):var instruction = "Look over"Instruction + = string2Instruction now equals "look over

together (or "concatenated") by adding an operator (+) to create a new string:let"hello"let" there"var welcome = string1 + string2// welcome 现在等于 "hello there"You can also add a string to an already existing string variable with the addition assignment operator (+ =):var instruction = "look over"instruction += string2// instruction 现在等于 "look over there"You can append a character to the end of a string variable using the Append () method:let exclamationMark: Character = "!"welcome.append(exclam

a blue view - $ /* $ ( Nslayoutattribute) property of the (ID) object - (nslayoutrelation) Relationship (> = - ( Nslayoutattribute) property of the (ID) object the multiplied by the parameters of the multiplier plus the constant parameters - */Wuyi the //Constraint of Height -Nslayoutconstraint *blueheight = [Nslayoutconstraint constraintwithitem:blueview attribute:nslayoutattributeheight Relatedby:nslayoutrelationequal Toitem:nil

STM32 Timer is a powerful module, the timer is also very high frequency, timer can do some basic timing, also can do PWM output or input capture function.Clock source problem:There are eight named Timx , of which TIM1 and TIM8 hang on the APB2 bus, while tim2-tim7 hangs onAPB1 on the bus. Where TIM1TIM8 is called Advanced control Timer. Their APB2 bus is also better than the APB1 bus. APB2 can work at 72MHz , while APB1 is 36MHzmaximum.The timer's clock does not come directly from the APB1 or AP

IOS_AutoLayout, iosautolayout code1. You must disable autoresizing before using code to create AutoLayout. /*** A control is centered in the parent control */-(void) centerTest {// 1. add control UIView * blueView = [[UIView alloc] init]; blueView. backgroundColor = [UIColor blueColor]; [self. view addSubview: blueView]; // 2. add constraints // disable autoresizing blueView. height = NO;/** width and height: 100 position: center in the parent control * // width = 100 NSLayoutConstraint * width

(NSInteger, NSLayoutRelation ){NSLayoutRelationLessThanOrEqual =-1, "NSLayoutRelationEqual = 0, "="NSLayoutRelationGreaterThanOrEqual = 1, "> ="};Fourth parameter reference object (reference Control)The fifth parameter references the properties of the control.Multiplier MultiplicationConstant +FormulaItem1.attribute */// Remember// 1. When setting constraints for a control, you must disable autoresing on the control.BlueView. translatesAutoresizingMaskIntoConstraints = NO;RedView. translatesAut

official does not recommend that we set the frame again.If you use AutoLayout to constrain a control, and we used to use the frame constraint control, you must set the width/height /x/y, and if a constraint is missing, you will get an error. An error can cause some unknown bugs to be raised . If there is a red error: Represents a missing constraint, or a constraint has a conflict (constraint can be added repeatedly)If there is a yellow warning: represents the current position size and the const

STM32 Timer is a powerful module, the timer is also very high frequency, timer can do some basic timing, also can do PWM output or input capture function. Clock source problem: There are eight named Timx, of which TIM1 and TIM8 hang on the APB2 bus, while Tim2-tim7 hangs on APB1 on the bus. Where TIM1TIM8 is called the Advanced control timer. Their APB2 bus is also better than the APB1 bus. APB2 can work at 72MHz, while APB1 is 36MHz maximum. The timer's clock does not come directly from the AP

First, STM32 Universal timer principle The STM32 series of CPUs, with up to 8 timers, where TIM1 and TIM8 are advanced timers capable of producing three pairs of PWM complementary outputs, are often used for three-phase motor drives whose clocks are generated by the APB2 output. The other 6 are normal timers, and the clocks are generated by the APB1 output. The following figure is a screenshot of the timer clock section of the STM32 reference manual on the clock distribution chart: As can be se

always module, or the combined logic if it is levelIf it is along the signal Posedge or Negedge is the timing logic.13.begin-------End is similar to the {} in the C language.14.for Statement-----Loop Because the combined results could be a waste of resources.So it is generally used less, but in some specific design can playA multiplier effect.A total of logic units consumed by the 15.total logic element.16. Behavioral-level simulations can be underst

Beginner STM32, feel the most egg pain is its clock system, every time see its clock tree is a bit dizzy, although read a lot of this information, even has written a lot of STM32 module code, did some small project, but always still on this piece of vague, indefinitely, So I want to write a little bit of my knowledge of it, step-by-step, until the day of full straightened out, (these things are not original, just want to help themselves understand)In STM32, there are five clock sources for HSI,

8MHz.The ②HSE is a high-speed external clock that can be connected to a quartz/ceramic resonator or to an external clock source with a frequency range of 4mhz~16mhz.The ③LSI is a low-speed internal clock, an RC oscillator with a frequency of 40kHz.The ④LSE is a low-speed external clock with a quartz crystal with a frequency of 32.768kHz.The ⑤PLL is a phase-locked loop multiplier output whose clock input source can be selected as HSI/2, HSE, or HSE/2.

clock source, frequency range of 4mhz~16mhz.③, LSI is a low-speed internal clock, RC oscillator, frequency of 40kHz.④, LSE is a low-speed external clock, the frequency of 32.768kHz quartz crystals.The ⑤, PLL is a phase-locked loop multiplier output, and its clock input source can be selected as HSI/2, HSE, or HSE/2. The multiplier can be selected as 2~16 times, but its output frequency must not exceed 72MH

to an existing character variable, because the character value must contain a single character　　Four, string interpolationString interpolation is a new way to build a string that contains constants, variables, literals, and expressions. Each entry of the string literal that you insert is wrapped in parentheses prefixed with a backslash:Let multiplier = 3 letmessage = "\ (multiplier) times 2.5 are \ (Double

1, Nslayoutconstraint IntroductionMost of the adaptation interface with masonry tools, but also based on Nslayoutconstraint write! Automatic layout is achieved by using two class methods:+ (nsarray) format options: (nslayoutformatoptions) OPTs metrics: (nu Llable nsdictionaryID> *) Metrics Views: (NsdictionaryID> *) views;+ (Instancetype) Constraintwithitem: (ID) view1 attribute: (nslayoutattribute) attr1 Relatedby: (nslayoutrelation) re Lation Toitem: (NullableID) view2 attribute: (nslayoutattr

Display objects in AS3 have a transform property that can be set to change the size, rotation, and color characteristics of the display object. The Transform property also has its own properties, The ColorTransform property can change the color of the display object. The ColorTransform property must be set using new. Format: Display objects. Transform.colortransform = new ColorTransform (red multiplier, green mul