请问大佬们，我设置的switch case语句不进行跳转并且无限循环下面的菜单，请问问题出在哪里？

#include/*9．从键盘上输入若干人学生的成绩，输出其中的最高成绩和最低成绩，当输入负数时结束输入。*/
using namespace std;
void showmean(); /*菜单*/
void write(int a,int b,int c,int d,int m,int n); /*键入*/
void write2(int c,int d,int e,int g,int m,int n);
void out(int m,int n); /*输出*/
int main ()
{
showmean();
int work;
cin>>work;
while(work!=3)
{
switch(work)
{
case 1:void write();break;
case 2:void out();break;
default:cout<<"sorry,you enter wrong number !"< }
showmean();
int work;
}
system("pause");
cout return 0;
}
void showmean()/*菜单*/
{
cout cout cout cout cout cout }
void write(int a,int b,int c,int d,int m,int n) /*写入系统*/ /*成绩存入,a，b作为输入动量，m是高项，n是低项*/
{
cout cin>>a;
cout<<"students score : "< cin>>b;
m=b,n=b;
cout<<"-enter 1--- continue to input"< cout cin>>c;
switch(c)
{
case 1:void write2(int c,int d,int e,int g,int m,int n);break;
case 2:void showmean();break;
default:cout<<"sorry,you enter wrong number !"<<endl;
}
}

void out (int m,int n) /*输出数据*/
{
cout<<"the highest score :"< cout }
void write2 (int c,int d,int e,int g,int m,int n) /*输入副本（d是无意义值）*/
{
do
{
cout cin>>d;
cout<<"students score : "< cin>>e;
if(e>m)m=e;
else if(e cout cout cin>>g;
}while(g==2);
switch(g)
{
case 2:void showmean();break;
default:cout<<"sorry,you enter wrong number !"<<endl;
}
}