编辑代码

#include <iostream>
using namespace std;

void * xx(void* a,void* b){
    int c=25;
    return  &c ; //
}

int main() { 

    void *a = NULL;  
// 　　 int * b = NULL; //无法通过编译

	// cout <<   xx(3,2)        << endl;

    int a= 10;
    void *b = &a;
       
    printf("int a = %d\n",a);
    printf("void (int *)b =%d \n",*(int *)b);
    printf("void (double *)b =%d \n",*(double*)b); 

	return 0;
}