程序代码：

# include "stdio.h"
float max(float x,float y)
{
return x>y?x:y;
}
float min(float x,float y)
{
return x<y?x:y;
}

main()
{
float a=1,b=2, c;
float (*p)(float x, float y);
p=max;
c=(*p)(a,b); /*等效于 max(a,b)*/
printf("\nmax=%f",c);
p=min;
c=(*p)(a,b); /*等效于min(a,b)*/
printf("\nmin=%f",c); 
}

程序代码：

#include <stdio.h>

#ifdef __cplusplus
#include <typeinfo.h>   
typedef typeid(a).name ctype;
#else
typedef float ctype;
#endif

float max(ctype x, ctype y)
{
    return x > y ? x : y;
}
float min(ctype x, ctype y)
{
    return x < y ? x : y;
}

float dcall(float(*func)(ctype, ctype), ctype x, ctype y)
{
    return (*func)(x, y);
}

int main(int argc, char *argv[])
{
    float a=1, b=2;

    printf("max=%f\n", dcall(max, a, b));
    printf("min=%f\n", dcall(min, a, b));
}