My的部落格

#include <stdio.h>
#include <stdlib.h>

typedef int (*math)(int a,int b);

int plus(int a,int b)
{
return (a+b);
}

int minus(int a,int b)
{
return (a-b);
}

int main(int argc, char *argv[])
{
math ptr;

ptr=plus;
printf("plus=%d\n",ptr(5,2));

ptr=minus;
printf("minus=%d\n",ptr(5,2));
system("PAUSE");
return 0;
}

====================================

#include <stdio.h>
#include <stdlib.h>

typedef int (math)(int a,int b);

int plus(int a,int b)
{
return (a+b);
}

int minus(int a,int b)
{
return (a-b);
}

int main(int argc, char *argv[])
{
math *ptr;

ptr=plus;
printf("plus=%d\n",ptr(5,2));

ptr=minus;
printf("minus=%d\n",ptr(5,2));
system("PAUSE");
return 0;
}