1、打开Dev-c++软件,点击“新建源代码”。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/902397dda144ad3440b2f476dea20cf431ad8535?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
2、具体程序如下。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/64380cd7912397ddbb3beef55782b2b7d1a28784?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
3、编写完程序之后,点击运行即可得出结果。最后的结果是根据自己输入的n值和a值为基础来进行运行的,每次输入的值不同,结果也会不同。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/91529822720e0cf33be63d0a0446f21fbe09aa2a?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
4、for表示循环结构,i 表示循环条件,在编写程序时,注意给赋予增值变量的条件。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/4034970a304e251ff6829709a986c9177e3e53cd?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
5、term=term*10+a 中的term表示a的位数,跟随每次循环结构的变换,term不断被赋予新值。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/d1160924ab18972b5a1c713be8cd7b899e510a18?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
6、sum=sum+term 表示累加的值,每次循环之后的sum都会被赋予新值,所以,在编写程序时,要注意 i 的最大循环次数,否则,此程序会无限选循环下去,最终没有结果。