6.8 控制流语句(Control Flow Statement) 程序最小的独立单元是语句(statement),语句一般由分号结尾,缺省情况下,语句是顺序执行的,但是当涉及逻辑判断控制时,就要求有控制流程序语句。控制流程序语句分为条件语句和循环语句,在C语言中,条件语句有if、if-else、switch等,而循环过程则由while、do-while和for语句支持。...
控制流(control flow)语句分为两种:分支结构和循环结构。前者典型的是if条件语句,后者典型的是for循环。 5.1 Introduction 5.2 Choices 5.2.2 Vectorised if 5.2.3 switch statement 5.3 Loops 5.3.1 Common pitfalls 5.3.2 Related tool 5.1 Introduction 测试:如果读者能准确回答如下几个问题,就可以跳过本章的学习。
Control Flow StatementsThe statements inside your source files are generally executed from top to bottom, in the order that they appear. Control flow statements, however, break up the flow of execution by employing decision making, looping, and branching, enabling your program to conditionally ...
除了C语言传统的for-condition-increment循环,Swift加入了for-in循环,能更加容易的遍历arrays, dictionaries, ranges, strings等其他序列类型。 Swift的switch语句也比C语言的要强大很多。 Swift中switch语句的case语句不会“掉入”下一个case,避免了c语言忘记写break语句产生的错误。 case可以匹配许多不同的模式,包括范围...
aIn addition to expression statements, there are two other kinds of statements: declaration statements and control flow statements. A declaration statement declares a variable. You've seen many examples of declaration statements already: 除表示声明之外,有其他二声明: 声明声明和控制流声明。 声明声明宣称...
In C++, the variables can also be declared within a for loop. For instance, A variable declared inside the block of main() can be accessed anywhere inside main() i.e., the scope of variable in main() While loop A while loop is a control flow statement that allows the loop statements...
In this chapter, we will learn about various flow control statements. What are the Flow Control Statements? A Flow Control Statement defines the flow of the execution of the Program. There are 7 different types of flow control statements available in Python: if-else Nested if-else for while ...
我们今天看的if,while,for都是复合语句(compound statement), 复合语句就是包含其他语句的语句,除了if,while,for还有with,try以及函数和类定义。 而在复合语句中,如果我们什么都不需要做,就可以用pass,这就像C语言中只是一个分号的空语句 一个例子,代码在这个地方等待键盘Ctrl-C来终止。
In some programming languages, you write a break keyword at the end of every case statement. But in Go, when the logic falls into one case, it exits the switch block unless you explicitly stop it. To make the logic fall through to the next immediate case, use the fallthrough keyword....
Swift还提供了一个for-in循环,可以轻松地遍历array、dictionary、range、string和其他序列。 Swift的switch声明比它在许多c语言中的对应声明要强大得多。用例可以匹配许多不同的模式,包括间隔匹配、元组和对特定类型的强制转换。 switch 用例中的匹配值可以绑定到临时常量或变量,以便在用例主体中使用,并且可以用where子句...