c语言中的“函数类型” 与 ”函数指针类型“
参考：http://light4.github.com/Linux-C/ch23s08.html
/* * ===================================================================================== * * Filename: b.c * * Description: * * Version: 1.0 * Created: 09/15/2012 17:04:03 * Revision: none * Compiler: gcc * * Author: YOUR NAME (), * Organization: * * ===================================================================================== */#include <errno.h>#include <math.h> #include <stdio.h> #include <stdlib.h>#include <string.h>typedef void F(const char*); //define function type Ftypedef void (*PF)(const char*); //define a function pointer type PFF a;F* retPF(F* f){ // a function return a "function pointer type" (*f)("in Ret"); return f;} intmain ( int argc, char *argv[] ){ a("hell"); PF pF = a;printf ("\nProgram %s\n\n", argv[0] ); (*pF)("hello"); F* rP = retPF(a); rP("rP printed"); PF pF2 = retPF(a); pF2("PF2 printed");return EXIT_SUCCESS;}/* ---------- end of function main ---------- */void a(const char* str){ printf("%s\n", str);}