c ++用字符数组（字符串）替换什么

Question

我的任务是编写一个函数char * stringReplace(const char * str, const char * what, const char * with)，它用正确长度的新字符串将“what”替换为“with”。所以在函数内部我创建了函数返回的动态数组。但我的问题是如何删除它，因为如果我尝试在主函数中删除它，在我使用它之后，它说它是未定义的。不是没有范围的动态数组还是我错了？ 这是我的代码：

#include <iostream>

#include <string.h>

using namespace std;

bool areTheSame(const char * str, const char * what, unsigned p)
{


   return areEqual;
}


unsigned howManyTimes(const char * str, const char * what)
{

}


char * stringReplace(const char * str, const char * what, const char * with) 
{

}

int main()
{
   char str[1000];
   char what[1000];
   char with[1000];

   cout << "Enter your string\n";
   cin.getline(str, 1000);

   cout << "\nEnter \"what\" you want to replace\n";
   cin.getline(what, 1000);

   if (strlen(str) < strlen(what))
   {
      cout << "\"What\" contains more characters than the string!\n";
      return 0;
   }

   cout << "\nEnter with what you want to replace it\n";
   cin.getline(with, 1000);

   cout << "\nYour string with replaced words looks like\n";
   cout << stringReplace(str, what, with) << endl;

   return 0;
}

P.S 我删除了部分代码，因为我找到了我想要的答案，还有时间完成任务，我不确定我是否可以公开发布我的代码

Answer 1

您必须删除它以避免内存泄漏。你可以这样做：

int main()
{
   char str[1000];
   char what[1000];
   char with[1000];
   char *replaced;

   cout << "Enter your string\n";
   cin.getline(str, 1000);

   cout << "\nEnter \"what\" you want to replace\n";
   cin.getline(what, 1000);

   if (strlen(str) < strlen(what))
   {
      cout << "\"What\" contains more characters than the string!\n";
      return 0;
   }

   cout << "\nEnter with what you want to replace it\n";
   cin.getline(with, 1000);

   cout << "\nYour string with replaced words looks like\n";
   replaced = stringReplace(str, what, with);
   cout << replaced << endl;
   delete [] replaced;

   return 0;
}

但是请注意，这不是拆分分配/解除分配责任的最佳做法。