c语言错误2449,这个C语言的ERROR是怎么回事哦？

#include

void main()

{

int max(int x,int y,int z);

int a,b,c,d;

scanf("d%,d%,d%",&a,&b,&c);

d=max(a,b,c);

printf("max=d%\n",d);

}

int max(int x,int y,int z);

{

int h;

if(x>y,x>z) h=x;

if(y>x,y>z) h=y;

else h=z;

return(h);

}

错误提示是H1.c

C:\Users\kaven air\Desktop\H1.c(11) : error C2449: found '{' at file scope (missing function header?)

C:\Users\kaven air\Desktop\H1.c(17) : error C2059: syntax error : '}'

执行 cl.exe 时出错.

H1.obj - 1 error(s), 0 warning(s)

到底是哪错了哦