Go: package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"strconv"
)

const (
	initialBufSize = 100000
	maxBufSize     = 1000000
)

var sc *bufio.Scanner

func initScanner(r io.Reader) *bufio.Scanner {
	buf := make([]byte, initialBufSize)

	sc := bufio.NewScanner(r)
	sc.Buffer(buf, maxBufSize)
	sc.Split(bufio.ScanWords) // bufio.ScanLines
	return sc
}

func main() {
	sc = initScanner(os.Stdin)
	resolve()
}

func resolve() {
	results := []int{}
	for true {
		w, h := scanInt(sc), scanInt(sc)
		if w == 0 && h == 0 {
			break
		}
		grid := make([][]int, h)
		for i := 0; i < h; i++ {
			grid[i] = make([]int, w)
			for j := 0; j < w; j++ {
				grid[i][j] = scanInt(sc)
			}
		}
		num := 0
		for i := range loop0(h) {
			for j := range loop0(w) {
				start := pos{y: i, x: j}
				if grid[start.y][start.x] == 0 {
					continue
				}
				num++
				_dfs(grid, w, h, start)
			}
		}
		results = append(results, num)
	}
	for _, v := range results {
		fmt.Println(v)
	}
	return
}

func _dfs(grid [][]int, w, h int, start pos) {
	grid[start.y][start.x] = 0
	for _, df := range []pos{
		pos{1, 0}, pos{-1, 0},
		pos{0, -1}, pos{0, 1},
		pos{1, 1}, pos{-1, -1},
		pos{-1, 1}, pos{1, -1},
	} {
		np := addPos(start, df)
		if np.y < 0 || h <= np.y || np.x < 0 || w <= np.x {
			continue
		}
		if grid[np.y][np.x] == 0 {
			continue
		}
		_dfs(grid, w, h, np)
	}
}

type pos struct{ x, y int }

func addPos(p, d pos) pos {
	return pos{
		x: p.x + d.x,
		y: p.y + d.y,
	}
}

func loop0(n int) chan int {
	return loop(0, n-1, 1)
}

func loop1(n int) chan int {
	return loop(1, n, 1)
}

func loop(s, e, d int) chan int {
	ch := make(chan int)
	go func() {
		for i := s; i <= e; i += d {
			ch <- i
		}
		close(ch)
	}()
	return ch
}

// snip-scan-funcs
func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return int(i)
}
func scanString(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

C++: #include <iostream>
#include <vector>
using namespace std;
int ans;
int w, h;
//?§???????
vector<int> vx = { -1, 0, 1, -1, 1, -1, 0, 1 };
vector<int> vy = { 1, 1, 1, 0, 0, -1, -1, -1 };
vector<vector<int>> area;
int islands = 0;

//????±????????????¨????????¢?´¢
void dfs(int i,int j){
	for (int n = 0; n < vx.size(); n++){
		int x = j + vx[n];
		int y = i + vy[n];
		if (x >= 0 && x < w &&
			y >= 0 && y < h &&
			area[y][x] == 1){
			area[y][x] = 2;
			dfs(y,x);
		}
	}
}

int main(){
	while (1){
		cin >> w >> h;
		if (w == 0 && h == 0) break;
		//?????????
		islands = 0;
		area.clear();
		area = vector<vector<int>>(h, vector<int>(w));
		//??\???
		for (int i = 0; i < h; i++){
			for (int j = 0; j < w; j++){
				cin >> area[i][j];
			}
		}
		//??¨??¢?´¢
		for (int i = 0; i < h; i++){
			for (int j = 0; j < w; j++){
				if (area[i][j] == 1){
					islands++;
					area[i][j] = 2;
					dfs(i, j);
				}
			}
		}
		cout << islands << endl;
	}
	return 0;
}

C++: #include <iostream>
#include <vector>
using namespace std;
#define rep(i, b) for (int i = 0; i < int(b); i++)

int w, h;
vector<vector<int>> g;

int const dx[] = { 1, 1, 0, -1, -1, -1, 0, 1 };
int const dy[] = { 0, 1, 1, 1, 0, -1, -1, -1 };
inline bool in(int x, int y){
    return 0 <= x && x < w && 0 <= y && y < h;
}

void fill(int x, int y){
    g[y][x] = 0;
    rep(i, 8){
        int xx = x + dx[i];
        int yy = y + dy[i];
        if (in(xx, yy) && g[yy][xx]) fill(xx, yy);
    }
}

int main(){
    while (cin >> w >> h, w | h){
        g.assign(h, vector<int>(w));
        rep(i, h)rep(j, w) cin >> g[i][j];
        int c = 0;
        rep(i, h)rep(j, w){
            if (g[i][j]){
                c++;
                fill(j, i);
            }
        }
        cout << c << endl;
    }
}

C++: #include<iostream>
#include<queue>
using namespace std;

#define inRange(x,a,b) (a <= x && x < b)
int di[8] = {0,0,1,-1,1,1,-1,-1};
int dj[8] = {1,-1,0,0,1,-1,1,-1};

int main(){
    int w, h;
    while(cin >> w >> h, w+h){
        char mat[h][w];
        for(int i = 0; i < h*w; i++)    cin >> mat[i/w][i%w];
        int ans = 0;
        for(int i = 0; i < h; i++){
            for(int j = 0; j < w; j++){
                if(mat[i][j] == '0')    continue;
                ans++;
                mat[i][j] = '0';
                queue<pair<int,int>> q;
                q.push({i,j});
                while(!q.empty()){
                    auto p = q.front(); q.pop();
                    int x = p.first, y = p.second;
                    for(int k = 0; k < 8; k++){
                        int nx = x+di[k], ny = y+dj[k];
                        if(inRange(nx,0,h)&&inRange(ny,0,w)&&mat[nx][ny]=='1'){
                            mat[nx][ny] = '0';
                            q.push({nx,ny});
                        }
                    }
                }
            }
        }
        cout << ans << endl;
    }
    return 0;
}

C++: #include<iostream>
#include<cstdio>

#define W 50
#define H 50

using namespace std;
void dfs(int w, int h);
int map[H][W];
int dy[8] = {1,1,0,-1,-1,-1,0,1}, dx[8] = {0,-1,-1,-1,0,1,1,1};
int w,h;

int main(){
  int i = 0,j = 0,is=0;
  cin >> w >> h;

  while(w != 0 && h != 0){
    for(i = 0;i < h;i++){
      for(j = 0;j<w;j++){
	cin>>map[i][j];
      }
    }
    i = j = 0;
    is = 0;
    while(i <= h-1  && j <= w-1){
      if(map[i][j] == 1){
	dfs(i,j);
	cout << "dfs end" << endl;
	is++;
      }
      i++;
      if(i == h){
	i = 0;
	j++;
      }
    }
    cout <<"the number of island is " << is << endl;
    cin >> w >> h;
  }
  return 0;
}

void dfs(int x,int y){
  cout << "x is " << x << " y is " << y <<endl;
  int i = 0;
  map[x][y] = 0;
  for(i = 0;i < 8; i++){
    if(x + dx[i] > -1 && y + dy[i] > -1 && x + dx[i] < h && y + dy[i] < w){
      if(map[x + dx[i]][y + dy[i]] == 1){
	dfs(x + dx[i],y + dy[i]);
      }
    }
  }
}