循环结构是算法中的一种重要结构,有当型结构和直到型结构。要理解这两种结构的三个要素:循环变量、循环体、循环条件。下面举例分析,供参考。一、利用直到型结构,求输出结果例1如图1所示的程序框图,其输出结果a=____。解析按照框图指令要求运行,a的取值分别为1,3,7,15,31,63, Circulant structure is an important structure in the algorithm. It has a type structure and a type structure. To understand the three elements of these two structures: loop variables, loop bodies, and loop conditions. The following example analysis, for reference. First, the use of until type structure, seeking output results Example 1 shows a block diagram shown in Figure 1, the output a = ____. The analysis is performed in accordance with the requirements of the block diagram instructions. The value of a is 1,3,7,15,31,63 respectively.