Question

我尝试删除各种部件和构建，但没有任何因素导致lnk2019错误消失，甚至产生任何正常错误。

此刻所有内容都在一个文件中（完成后不会再出现）。该程序有三个单词列表，并用它们制作一个行话短语，你应该能够添加单词，删除单词，查看列表，恢复默认值，保存对文件的更改，以及从文件加载更改。

#include "stdafx.h"
#include <iostream>
#include <string.h>

using namespace std;

const int maxlist = 20;

string adj1[maxlist], adj2[maxlist], noun[maxlist];

void defaultlist(int list)
{
 if(list == 1)
 {
  adj1[0] = "green";
  adj1[1] = "red";
  adj1[2] = "yellow";
  adj1[3] = "blue";
  adj1[4] = "purple";

  int i = 5;
  while(i != maxlist)
  {
   adj1[i] = "";
   i = i + 1;
  }
 }

 if(list == 2)
 {
  adj2[0] = "shiny";
  adj2[1] = "hard";
  adj2[2] = "soft";
  adj2[3] = "spiky";
  adj2[4] = "furry";

  int i = 5;
  while(i != maxlist)
  {
   adj2[i] = "";
   i = i + 1;
  }
 }

 if(list == 3)
 {
  noun[0] = "cat";
  noun[1] = "dog";
  noun[2] = "desk";
  noun[3] = "chair";
  noun[4] = "door";

  int i = 5;
  while(i != maxlist)
  {
   noun[i] = "";
   i = i + 1;
  }
 }
return;
}


void printlist(int list)
{
 if(list == 1)
 {
  int i = 0;
  while(!(i == maxlist))
  {
   cout << adj1[i] << endl;
   i = i + 1;
  }
 }

 if(list == 2)
 {
  int i = 0;
  while(!(i == maxlist))
  {
   cout << adj2[i] << endl;
   i = i + 1;
  }
 }

 if(list == 3)
 {
  int i = 0;
  while(!(i == maxlist))
  {
   cout << noun[i] << endl;
   i = i + 1;
  }
 }
return;
}

string makephrase()
{
 int num1 = rand()%maxlist;
 int num2 = rand()%maxlist;
 int num3 = rand()%maxlist;
 int num4 = rand()%1;

 string word1, word2, word3;

 if(num4 = 0)
 {
  word1 = adj1[num1];
  word2 = adj2[num2];
 }
 else
 {
  word1 = adj2[num1];
  word2 = adj1[num2];
 }

 word3 = noun[num3];

return word1 + " ," + word2 + " " + word3;
}

string addword(string word, int list)
{
 string result;

 if(list == 1)
 {
  int i = 0;
  while(!(adj1[i] == "" || i == maxlist))
  {
   i = i + 1;
  }

  if(i == maxlist) result = "List is full. Please try again.";
  if(adj1[i] == "")
  {
   adj1[i] = word;
   result = "Word was entered successfully.";
  }
 }

 if(list == 2)
 {
  int i = 0;
  while(!(adj2[i] == "" || i == maxlist))
  {
   i = i + 1;
  }

  if(i == maxlist) result = "List is full. Please try again.";
  if(adj2[i] == "")
  {
   adj2[i] = word;
   result = "Word was entered successfully.";
  }
 } 

 if(list == 3)
 {
  int i = 0;
  while(!(noun[i] == "" || i == maxlist))
  {
   i = i + 1;
  }

  if(i == maxlist) result = "List is full. Please try again.";
  if(noun[i] == "")
  {
   noun[i] = word;
   result = "Word was entered successfully.";
  }
 }
return result;
}
string removeword(string word, int list)
{
 string result;

 if(list == 1)
 {
  int i = 0;
  while(!(adj1[i] == word || i == maxlist))
  {
   i = i + 1;
  }

  if(i == maxlist) result = "Word is not on the list. Please try again.";
  if(adj1[i] == word)
  {
   adj1[i] = "";
   result = "Word was removed successfully.";
  }
 }

  if(list == 2)
 {
  int i = 0;
  while(!(adj2[i] == word || i == maxlist))
  {
   i = i + 1;
  }

  if(i == maxlist) result = "Word is not on the list. Please try again.";
  if(adj2[i] == word)
  {
   adj2[i] = "";
   result = "Word was removed successfully.";
  }
 }

 if(list == 3)
 {
  int i = 0;
  while(!(noun[i] == word || i == maxlist))
  {
   i = i + 1;
  }

  if(i == maxlist) result = "Word is not on the list. Please try again.";
  if(noun[i] == word)
  {
   noun[i] = "";
   result = "Word was removed successfully.";
  }
 }

return result;
}



/////////////////////////////main///////////////////////////////////


int main()
{
 string mainselection;
 string makeselection;
 string phrase;

 defaultlist(1);
 defaultlist(2);
 defaultlist(3);

 cout << "This program generates jargon phrases made of two adjectives and one noun,";
 cout << " on three lists. Each list may contain a maximum of " << maxlist << "elements.";
 cout << " Please choose from the following menu by typing the appropriate number ";
 cout << "and pressing enter." << endl;

 cout << endl;

 cout << "1. Make a jargon phrase." << endl;
 cout << "2. View a list." << endl;
 cout << "3. Add a word to a list." << endl;
 cout << "4. Remove a word from a list." << endl;
 cout << "5. Restore default lists." << endl;
 cout << "More options coming soon!." << endl;

 cin >> mainselection

 if(mainselection == 1)
 {
  phrase = makephrase();

  cout << "Your phrase is " << phrase << "." << endl;
  cout << "To make another phrase, press 1. To go back to the main menu,";
  cout << " press 2. To exit the program, press 3." << endl;

  cin >> makeselection;

  while(!(makeselection == "1" || makeselection == "2" || makeselection == "3"))
  {
   cout << "You have entered an invalid selection. Please try again." << endl;
   cin >> makeselection;
  }

  while(makeselection == "1")
  {
   phrase = makephrase();
   cout << "To make another phrase, press 1. To go back to the main menu,";
   cout << " press 2. To exit the program, press 3." << endl;
  }

  if(makeselection == "2") main();
  if(makeselection == "3") return 0;
 }

return 0;
}

//Rest of the options coming soon!

Answer 1

根据gcc的问题是，您尚未为rand()函数声明正确的包含 - 我添加了#include <cstdlib>，问题就消失了。

我还应该在你的主要功能中添加：

cin >> mainselection;
if ( mainselection == 1 )

哪个不起作用。 Mainselection是一个字符串，只能使用类比较方法进行比较，如下所示：

cin >> mainselection;
if ( mainselection.compare("1") )

如果它们相等，它们将返回0。

此外，如果您使用std::vector，您可以在C ++中轻松拥有动态大小的数组，您只需将项目推送到向量的背面即可。意味着您不需要对限制进行硬编码。

Answer 2

一些建议可以帮助您：

第107行：if(num4 = 0)（赋值运算符）应为if(num4 == 0)（等于运算符）。
第260行：cin >> mainselection之后你遗漏了一个分号。
第261行：if(mainselection == 1)非法，mainselection为std::string。
第284行：if(makeselection == "2") main();不允许在C ++中递归调用main()函数。

lnk2019在非常简单的c ++程序中出错

2 个答案: