小编sep*_*p2k的帖子

我刚开始探索APL.虽然熟悉C++和python,但我执行了一个简单的程序'打印前n个奇数',其中n是APL中的输入.请帮助APL程序员.

我正在尝试complile这个简单的应用程序:

#include <winsock2.h>
#include <iostream.h>
#include <string.h>

using namespace std;
unsigned long WinsockStart()

{

WSADATA wsa;
unsigned long ULONG;
struct hostent *target;

if(WSAStartup(MAKEWORD(2,2), &wsa) < 0)
{
cout << "Exploit failed!" << endl;

WSACleanup();
return 1;
}

if((target=gethostbyname("www.website.com/script.php"))<0)
{
cout << "That is not a valid host bro!" << endl;

WSACleanup();
return 2;
}

ULONG = *(unsigned long*) target->h_addr;
return ULONG;
}

void error_exit(string text)
{
cout << text;
WSACleanup();
exit(EXIT_FAILURE);
}

int main()
{
SOCKET sock;
struct sockaddr_in addr; …

/**
 * Copyright (c) 2006-2018 Apple Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, …

#include<stdio.h>

int main()

{

  int c, nl;

  nl = 0;

  while ((c = getchar()) ! = EOF){
    if (c =='\n'){
      nl++;
    }
    printf("%d\n", nl);
  }

}

当我尝试编译时,gcc -o fun2 countline.c 我得到了这个错误

countline.c: In function 'main':
countline.c:12:26: error: expected ')' before '!' token

导致此错误的原因是什么？我错过了什么？我无法弄清楚.

public MyObject method1() {
  boolean someBoolean = true;
  MyObject obj = ...;

  if(!someBoolean) method1();
  else return obj;
  // flow should never come to this statement, but compiler requires this return. why?
  return null;
}

为什么java编译器需要最终的return语句？

-Prasanna

cmd中的类文件,使用以下命令,我得到输出:

错误是:"错误:无法找到或加载主类CustomerManager.class"

知道如何解决这个问题吗？