会C++软件的请帮个忙

#include <iostream>
using namespace std;
void main()
{
int a,b,c,d,e,A(0),B(0),C(0),D(0),E(0),n,s,i,G,N,H,J(0),num,L(999),numl;
cout<<"请输入班级人数"<<endl;
cin>>i;
i-=1;
for (;i>=0;i--)
{
cout<<"请输入学号"<<endl;
cin>>n;
cout<<n<<"号"<<endl;
cout<<"请输入该同学的性别,女生请输入g，男生请输入b"<<endl;
cin>>s;
if (s=='g')
{ cout<<"女生"<<endl; G++; }
else
{ cout<<"男生"<<endl; B++; }

cout<<"请输入该名同学五科的成绩"<<endl;
cin>>a>>b>>c>>d>>e;
while (a<60)
A++;
while (b<60)
B++;
while (c<60)
C++;
while (d<60)
D++;
while (e<60)