C语言undefined, assuming extern returning int,怎么解决?

Question

C语言undefined, assuming extern returning int,怎么解决?

Answer 1

#include<stdio.h> void&nbsp;aaa(void);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/*&nbsp;声明函数*/ void&nbsp;main() { &nbsp;&nbsp;&nbsp;&nbsp;aaa(); } void&nbsp;aaa(void)&nbsp;&nbsp;&nbsp;&nbsp;/*&nbsp;定义函数*/ { &nbsp;&nbsp;&nbsp;&nbsp; } 规范的写法是函数既要有定义，也要有声明