求助：编译时出现error C2440
程序代码：#include"stdio.h"
#include"stdlib.h"
#include"malloc.h"
//输入一个结构体类型变量的成员，并输出
struct data
{
int day,month,year;
};
struct stu
{
char name[20];
long num;
struct data birthday;
};
main()
{
struct stu *student;
student=malloc(sizeof(struct stu));
printf("Input name,number,year,month,day:\n");
scanf("%s",student->name);
scanf("%ld",&student->num);
scanf("%d%d%d",&student->birthday.year,&student->birthday.month,&student->birthday.day);
printf("%20s%10ld%10d//%d//%d\n",student->name,&student->num,&student->birthday.year,&student->birthday.month,&student->birthday.day);
}
编译时出现如下错误：--------------------Configuration: as - Win32 Debug--------------------
Compiling...
a.cpp
E:\C练习\as\a.cpp(17) : error C2440: '=' : cannot convert from 'void *' to 'struct stu *'
Conversion from 'void*' to pointer to non-'void' requires an explicit cast
E:\C练习\as\a.cpp(23) : warning C4508: 'main' : function should return a value; 'void' return type assumed
执行 cl.exe 时出错.
a.obj - 1 error(s), 0 warning(s)
请大家给我指点下，谢谢！Compiling...
a.cpp
E:\C练习\as\a.cpp(17) : error C2440: '=' : cannot convert from 'void *' to 'struct stu *'
Conversion from 'void*' to pointer to non-'void' requires an explicit cast
E:\C练习\as\a.cpp(23) : warning C4508: 'main' : function should return a value; 'void' return type assumed
执行 cl.exe 时出错.
a.obj - 1 error(s), 0 warning(s)
我把文件改成.c格式 然后去掉printf中的&就可以正确运行了。但是C和C++不是兼容的吗？我运行其他C文件的时候也是保存的C++形式，不会出现错误。