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1.Basic
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#include <stdio.h>
#include <stdlib.h>
 
int main()
{
 int add(int,int); 
 int def(int, int);
 printf("%d\n", add(1,3));
 printf("%d\n", def(3,1));
 return 0;
}
 
int add(int a, int b) { return a+b; }
int def(int a, int b)   { return a-b; }
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 ReturnValue  (*fun_ptr)();
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#include <stdio.h>
#include <stdlib.h>
 
int main()
{
 int add(int,int); 
 int def(int, int);
 int (*p)();
 
 p = add;
 printf("%d\n", p(1,3));
 
 p = def;
 printf("%d\n", p(3,1));
 return 0;
}
 
int add(int a, int b) { return a+b; }
int def(int a, int b)   { return a-b; }
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#include <stdio.h>
#include <stdlib.h>
 typedef struct FuncPtrEle
{
    int (*fun_ptr)();
    int type_code;
} ptr_t;
int add(int,int);
int def(int, int);
 
int main()
{
    int i = 0;
    ptr_t ptr_array[2];
 
    ptr_array[0].fun_ptr = add;                        //ÕâÁ½Ö¸Õ븳ֵµÄ¹ý³Ì¿ÉÒÔÈÎÒâ·¢»ÓÏëÏóÁ¦¡£
    ptr_array[1].fun_ptr = def;                         //ÖÁÓÚ×÷Óã¬ÏëÏëÃæÏò¶ÔÏóÖеĶà̬°É....
 
    for(i = 0; i < 2; i++)
    {
          printf("%d\n", ptr_array[i].fun_ptr(3,1));
    }
    return 0;
}
 
int add(int a, int b) { ret


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