#include <iostream>
using namespace std;

void main()
{
  cout << "Hello World!" << endl;
}

#include<stdio.h>

main()
{
    printf("Hello World");

}

// C++ includes used for precompiling -*- C++ -*-

// Copyright (C) 2003-2013 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file stdc++.h
 *  This is an implementation file for a precompiled header.
 */

// 17.4.1.2 Headers

// C
#ifndef _GLIBCXX_NO_ASSERT
#include <cassert>
#endif
#include <cctype>
#include <cerrno>
#include <cfloat>
#include <ciso646>
#include <climits>
#include <clocale>
#include <cmath>
#include <csetjmp>
#include <csignal>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>

#if __cplusplus >= 201103L
#include <ccomplex>
#include <cfenv>
#include <cinttypes>
#include <cstdalign>
#include <cstdbool>
#include <cstdint>
#include <ctgmath>
#include <cwchar>
#include <cwctype>
#endif

// C++
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>

#if __cplusplus >= 201103L
#include <array>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <forward_list>
#include <future>
#include <initializer_list>
#include <mutex>
#include <random>
#include <ratio>
#include <regex>
#include <scoped_allocator>
#include <system_error>
#include <thread>
#include <tuple>
#include <typeindex>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
#endif

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

inline int get_fsize(const char *path) {
	struct stat sb;
	int err;
	err = stat(path, &sb);
	if (err) {
		fprintf(stderr, "fstat error! [%s]\n", strerror(errno));
		return -1;
	}
	return sb.st_size;
}

int main(int argc, char *argv[]) {

	FILE *fp;
	char *path, *buf;
	int i, cnt = 0;
	int fsize;
	int length;

	if (argc < 2) {
		fprintf(stderr, "require file path.\n");
		return -1;
	}
	path = argv[1];
	fsize = get_fsize(path);
	if (fsize < 0) {
		return -1;
	}
	buf = (char*)malloc(fsize);

	fp = fopen(path, "r");
	length = fread(buf, 1, fsize, fp);
	if (length < fsize) {
		fprintf(stderr, "fread error! [%d]\n", length);
	}

	for (i=0; i<fsize; i++) {
		if (buf[i] == 0x00) cnt++;
	}

	free(buf);
	fclose(fp);

	printf("%s: size=%d cnt=%d\n", path, fsize, cnt);

	return 0;
}

#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

inline int get_fsize(int fd) {
	struct stat sb;
	int err;
	err = fstat(fd, &sb);
	if (err) {
		fprintf(stderr, "fstat error! [%s]\n", strerror(errno));
		return -1;
	}
	return sb.st_size;
}

int main(int argc, char *argv[]) {

	int fd;
	char *path, *addr;
	int i, cnt = 0, err;
	int fsize;

	if (argc < 2) {
		fprintf(stderr, "require file path.\n");
		return -1;
	}
	path = argv[1];

	fd = open(path, O_RDONLY);
	fsize = get_fsize(fd);
	if (fsize < 0) {
		return -1;
	}
	addr = mmap(NULL, fsize, PROT_READ, MAP_SHARED, fd, 0);

	err = madvise(addr, fsize, MADV_SEQUENTIAL | MADV_WILLNEED);
	if (err) {
		fprintf(stderr, "madvise error! [%d]\n", err);
	}

	for (i=0; i<fsize; i++) {
		if (addr[i] == 0x00) cnt++;
	}

	err = munmap(addr, fsize);
	if (err) {
		fprintf(stderr, "munmap error! [%d]\n", err);
	}
	close(fd);

	printf("%s: size=%d cnt=%d\n", path, fsize, cnt);

	return 0;
}

#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

inline int get_fsize(int fd) {
	struct stat sb;
	int err;
	err = fstat(fd, &sb);
	if (err) {
		fprintf(stderr, "fstat error! [%s]\n", strerror(errno));
		return -1;
	}
	return sb.st_size;
}

int main(int argc, char *argv[]) {

	int fd;
	char *path, *addr;
	int i, cnt = 0, err;
	int fsize;

	if (argc < 2) {
		fprintf(stderr, "require file path.\n");
		return -1;
	}
	path = argv[1];

	fd = open(path, O_RDONLY);
	fsize = get_fsize(fd);
	if (fsize < 0) {
		return -1;
	}
	addr = mmap(NULL, fsize, PROT_READ, MAP_SHARED, fd, 0);

	for (i=0; i<fsize; i++) {
		if (addr[i] == 0x00) cnt++;
	}

	err = munmap(addr, fsize);
	if (err) {
		fprintf(stderr, "munmap error! [%d]\n", err);
	}
	close(fd);

	printf("%s: size=%d cnt=%d\n", path, fsize, cnt);

	return 0;
}

##include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

inline int get_fsize(int fd) {
	struct stat sb;
	int err;
	err = fstat(fd, &sb);
	if (err) {
		fprintf(stderr, "fstat error! [%s]\n", strerror(errno));
		return -1;
	}
	return sb.st_size;
}

int main(int argc, char *argv[]) {

	int fd;
	char *path, *buf;
	int i, cnt = 0;
	int fsize;
	int length;

	if (argc < 2) {
		fprintf(stderr, "require file path.\n");
		return -1;
	}
	path = argv[1];

	fd = open(path, O_RDONLY);
	fsize = get_fsize(fd);
	if (fsize < 0) {
		return -1;
	}
	buf = (char*)malloc(fsize);
	length = read(fd, buf, fsize);
	if (length < fsize) {
		fprintf(stderr, "read error! [%d]\n", length);
	}

	for (i=0; i<fsize; i++) {
		if (buf[i] == 0x00) cnt++;
	}

	free(buf);
	close(fd);

	printf("%s: size=%d cnt=%d\n", path, fsize, cnt);

	return 0;
}