在C语言中，嵌套函数

#include  main(void) { printf("Main Function"); int my_fun() { printf("my_fun function"); // defining another function inside the first function. int my_fun2() { printf("my_fun2 is inner function"); } } my_fun2(); }

text.c:(.text+0x1a): undefined reference to `my_fun2'

#include  main(void) { auto int my_fun(); my_fun(); printf("Main Function
"); int my_fun() { printf("my_fun function
"); } printf("Done"); }

my_fun function Main Function Done