跟着普中51单片机开发板学矩阵键盘的时候遇到的问题
出现c(85): warning C291: not every exit path returns a value linking...可能的原因就是while后边没加“;”
没加前编译后是这样
![](https://www.icode9.com/i/l/?n=22&i=blog/2933481/202207/2933481-20220720232014968-846993544.png)
加了之后是这样
![](https://www.icode9.com/i/l/?n=22&i=blog/2933481/202207/2933481-20220720232034760-913054593.png)
加了以后矩阵键盘功能是对的
标签:...,C291,linking,returns,warning,every,exit,85
来源: https://www.cnblogs.com/y2863798977/p/16500283.html