这是因为 C 语言按以下规则进行运算 if (x=10):10 赋值给 x(只要非 0 的数赋值的语句,其赋值表达式的值永远为真),因此 x 现在值为 10。此时 if 的测试表达式值为 10,该值永远为真,因为非 0 值永远为真。所以,if (x = 10) 将永远为真,这就不是我们运行 if 所期待的结果。另外,x 被赋值为 10...
The third "if" statement is different. Here we use a logical AND statement using a double "&" or "&&". A single "&" is a bitwise function and will produce a compile error. Here we are checking S1 AND S2. Only when both are true (return 1) does LED3 turn on. A problem occurs...
if(booleanexpression) { statement(s) } elseif(booleanexpression) { statement(s) } else { statement(s) } 3.3 //(单行注释) Comments(注释) 注释用于提醒自己或他人程序是如何工作的。它们会被编译器忽略掉,也不会传送给处 理器,所以它们在 Atmega 芯片上不占用体积。注释的唯一作用就是使你自己理解或...
大括号中的主要用途功能void myfunction(datatype argument)statements(s)循环while (boolean expression)statement(s)dostatement(s)while (boolean expression);for (initialisation; termination condition; incrementing expr).精品文档statement(s)条件语句if (boolean expression)statement(s 27、)else if (boolean ...
21、oolean expression);for (initialisation; termination condition; incrementing expr)statement(s)/条件语句if (boolean expression)可修改精品文档statement(s)else if (boolean expression)statement(s)elsestatement(s)注释注释注释是程序中的一些行,用于让自己或他人了解程序的工作方式。他们会被编译器忽略,而不会...
When using anifstatement, the code in its body runsonlywhen the if statement evaluates to true. If it evaluates to false, program execution skips the code in the body of the if statement and goes to the statement the body of theifstatement. ...
大括号中的主要用途 功能 void myfunction(datatype argument){ statements(s) } 循环 while (boolean expression) { statement(s) } do { statement(s) } while (boolean expression); for (initialisation; termination condition; incrementing expr) { statement(s) } 条件语句 if (boolean expression) { ...
If Statement(Conditional): how to use an if statement to change output conditions based on changing input conditions. 如果声明(视情况而定): 如何使用if语句来改变输出条件改变输 入条件的基础上。 For Loop: controlling multiple LEDs with a for loop and. 循环:循环 控制多个LED。 Array : a variatio...
2.1if 2。2if..。else 2.3for 2.4switchcase 2.5while 2.6do...while 2.7break 2。8continue 2。9return 2。10goto 三、扩展语法 3。1;(分号) 3.2{}(花括号) 3.3//(单行注释) 3。4/**/(多行注释) 3。5#define 3。6#include 四、算数运算符 ...
resistor will be disabled. If the pin is set to OUTPUT via pinMode(), you can set the pin to HIGH (5 volts) or LOW (0 volts/GND) via the digitalWrite() statement. If the pin is set to INPUT mode via pinMode(), when you set the pin to HIGH via the digitalWrite() statement,...