error C2449: found '{' at file scope (missing function header?)
 error C2059: syntax error : '}'


下面是代码
int max(int a,int b);

main()
{
    int x,y,z;
    int max(int a,int b);
    printf("input two numbers:\n");
    scanf("%d%d",&x,&y);
    z = max(x,y);
    printf("maxnum = %d",z);
}

int max(int a, int b);

{
    if(a>b) return a;
    else return b;
}

刚刚接触，所以什么也不懂，谢谢各位啦~