do循环、loop循环、repeat循环。 现在的for-in是一个趋势,一般遍历数组。 ———Python家族——— SETL语言(1969年) 注:是Python他爷爷。 for i in [1..5] loop end loop; 编历字符串: s:="ABCDE"; for c in s loop end loop; 遍历map: for [key,value] in emp loop end loop; forall循环 f...
中文: 如果你有一个像`colors = ['red', 'green', 'blue']`这样的颜色列表,你可以使用`for...in`来打印出每种颜色。 2. 英语: When you have a tuple of numbers, say `nums = (1, 2, 3)`, the `for...in` loop can help you access each number easily. 中文: 当你有一个数字元组,...
For Loop in C - Most programming languages including C support the for keyword for constructing a loop. In C, the other loop-related keywords are while and do-while. Unlike the other two types, the for loop is called an automatic loop, and is usually the
What are Loop in C? Loops are a block of code that executes itself until the specified condition becomes false. In this section, we will look in detail at the types of loops used in C programming.What is the Need for Looping Statements in C?
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for xx in (select 语句) 这是隐式游标，这个结构中不能带参数，或者说普通的游标，隐式或显式的都不能带参数，使用参数游标或引用（动态）游标。例如：declare cursor cur(C_value number) is select col_A,col_B from tableA where col_C=C_value ;begin for xx in cur loop --处理 end...
[Error] 'for' loop initial declarations are only allowed in C99 or C11 mode 这句话的意思是,直接在for循环中声明变量只在C99或者C11模式下允许。这是什么意思?这是因为,部分人使用的编译器是老版本的(一般都是C89的,例如gcc编译器),而这种直接在for循环中声明变量的方法是C99后来添加的,所以在C89模式编...
error:continueis only allowed inside a loop 在使用continue关键字的时候,for in可以正常遍历并且执行,而且continue的作用是跳出本次循环,不影响后面的执行; 而在forEach中,swift是不允许这样执行的,报错的原因是说continue只允许出现在循环语句中,也就是说不能使用在forEach的closure中。
Now, I would like to get some pointers as to how to properly take advantage of the "for...in" loop in JavaScript, I already did some research and tried a couple things but it is still not clear to me how to properly use it.