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#include<bits/stdc++.h>
using namespace std;
int n;
cout<<"enter the number of vertics";
cin>>n;
 
int arr[n][n];
int visit[n];
int front=0;
int rear=0;
int queue[100]={-1};
void enqueue(int data)
{
	rear=(rear+1)%100;
	queue[rear]=data;
}
int dequeue()
{
	front++;
	return queue[front-1];
}
void BFS(int index)
{
	int j;
	visit[index]=1;
	enqueue(index);
 
	while(front<rear)
	{
		index=dequeue();
		visit[index]=1;
		cout<<index<<' ';
		for(j=0;j<n;j++)
		{
			if(visit[j]!=1)
			enqueue(arr[index][j]);
		}
	}
}
int main()
{
	int i,j;
 
	cout<<"now enter the matrix";
	for(i=0;i<n;i++)
	for(j=0;j<n;j++)
	{
		cin>>arr[i][j];
	}
 
	BFS(0);
return 0;
}

prog.cpp:4:1: error: ‘cout’ does not name a type
 cout<<"enter the number of vertics";
 ^~~~
prog.cpp:5:1: error: ‘cin’ does not name a type
 cin>>n;
 ^~~
prog.cpp:7:10: error: array bound is not an integer constant before ‘]’ token
 int arr[n][n];
          ^
prog.cpp:7:13: error: array bound is not an integer constant before ‘]’ token
 int arr[n][n];
             ^
prog.cpp:8:12: error: array bound is not an integer constant before ‘]’ token
 int visit[n];
            ^
prog.cpp: In function ‘void enqueue(int)’:
prog.cpp:15:2: error: reference to ‘queue’ is ambiguous
  queue[rear]=data;
  ^~~~~
prog.cpp:11:5: note: candidates are: int queue [100]
 int queue[100]={-1};
     ^~~~~
In file included from /usr/include/c++/6/queue:64:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:86,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_queue.h:96:11: note:                 template<class _Tp, class _Sequence> class std::queue
     class queue
           ^~~~~
prog.cpp: In function ‘int dequeue()’:
prog.cpp:20:9: error: reference to ‘queue’ is ambiguous
  return queue[front-1];
         ^~~~~
prog.cpp:11:5: note: candidates are: int queue [100]
 int queue[100]={-1};
     ^~~~~
In file included from /usr/include/c++/6/queue:64:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:86,
                 from prog.cpp:1:
/usr/include/c++/6/bits/stl_queue.h:96:11: note:                 template<class _Tp, class _Sequence> class std::queue
     class queue
           ^~~~~
prog.cpp: In function ‘void BFS(int)’:
prog.cpp:25:2: error: ‘visit’ was not declared in this scope
  visit[index]=1;
  ^~~~~
prog.cpp:36:12: error: ‘arr’ was not declared in this scope
    enqueue(arr[index][j]);
            ^~~
prog.cpp: In function ‘int main()’:
prog.cpp:48:8: error: ‘arr’ was not declared in this scope
   cin>>arr[i][j];
        ^~~

Standard output is empty