–awk Do while循环称为退出控制循环,而 awk while 循环称为入口控制循环。因为 while 循环首先检查条件,然后决定是否执行主体。但是awk do while循环执行一次主体,然后只要条件为真就重复执行主体。 Syntax:doactionwhile(condition) 即使条件为假,在开始时至少执行一次操作。 2. awk Do While
do-while 循环是一种后测试循环(also known as exit-controlled loop):首先执行循环体中的语句,之后才评估循环的继续条件。与之对比的是 for 和 while 循环,它们都是先测试循环条件,然后再执行循环体,称为前测试循环(pre-tested loop)。在实际编程中,根据具体需求选择最合适的循环类型非常重要。 二、SYNTAX AND ...
The do-while statement lets you repeat a statement or compound statement until a specified expression becomes false. Syntax iteration-statement: do statement while ( expression ) ; The expression in a do-while statement is evaluated after the body of the loop is executed. Therefore, the body ...
Free-Form Syntax(not allowed - use theDOWoperation code) CodeFactor 1Factor 2Result FieldIndicators DOWxxComparandComparand The DOWxx operation code precedes a group of operations which you want to process when a given condition exists. To specify a more complex condition, immediately follow the...
The syntax for ado whilestatement is: doloop_body_statementwhile(cond_exp); where: loop_body_statementis any valid C statement or block. cond_expis an expression that is evaluated at the end of each pass through the loop. If the value of the expression is "false" (i.e., compares equ...
Do-While循环是各种While循环。 在Do-While循环中,运行脚本块后会评估条件。 与 While 循环中一样,只要条件的计算结果为 true,脚本块就重复执行。 与Do-While循环一样,Do-Until循环始终在评估条件之前至少运行一次。 但是,脚本块仅在条件为 false 时运行。
Syntax do{ // code block to be executed } while(condition); Note:The semicolon;after thewhilecondition is required! Do/While Example The example below uses ado/whileloop. The loop will always be executed at least once, even if the condition is false, because the code block is executed ...
循环首先执行一次语句,然后检查条件是否为true。如果条件为true,则执行该语句集,直到条件变为false。如果条件为false,则循环将在此处结束。do while 因此,两者之间的区别在于,循环至少执行一次语句集。do while Syntax while(<condition>)begin// Multiple statementsenddobegin// Multiple statementsendwhile(<condition>...
while loop do...while loop In the previous tutorial, we learned about for loop. In this tutorial, we will learn about while and do..while loop. while loop The syntax of the while loop is: while (testExpression) { // the body of the loop } How while loop works? The while loop ev...
while loop do...while loop In the previous tutorial, we learned about the C++ for loop. Here, we are going to learn about while and do...while loops. C++ while Loop The syntax of the while loop is: while (condition) { // body of the loop } Here, A while loop evaluates the con...