访问冲突读取位置 (Visual Studio C++) [英] Access violation reading Location (Visual Studio C++)

问题描述

我正在尝试形成给定字符串的子字符串，以便动态分配字符串和子字符串，子字符串是二维数组，因为它将包含多个子字符串.

I am trying to form substrings of a given string, so that both string and substring are dynamically allocated, substring is 2D array as it will contain multiple substrings.

我不知道我哪里出错了.

I can't figure out where I am going wrong.

错误:

Unhandled exception at 0x54E0F791 (msvcr110d.dll) in <filename>.exe: 0xC0000005: Access violation reading location 0x00000065

这是我的代码:

char **sub = new char* [10];
sub[0] = new char [10];
strcpy(sub[0],"");

char *S = new char[10];
strcpy(S,"");
cin.getline(S,10);

for(int j = 2; j<10; j++)
    strcat(sub[0],(char*)S[j-1]);

cout<<sub[0];

推荐答案

从您的代码看来，您的意图是将 sub[0] 连接到 S.简单的解决方案将删除 for 循环并简单地编写.

As it seems from your code that your intent is to concatenate sub[0] to S. Simple solution will be remove for loop and simply write.

strcat(sub[0],S);

您代码中的问题是strcat(sub[0],(char*)S[j-1]);，您试图将 char 转换为字符指针.

Problem in your code is strcat(sub[0],(char*)S[j-1]);, you are trying to cast char as character pointer.

现在我在您的代码中看到的另一件事是您还没有从第 0 个索引开始访问 S.这可能是您的要求.如果你想从 index 1 连接起来，那也有解决方案.

Now other thing which I see in your code is you havn't started accessing S from 0th index. That might be your requirement or so. Even that has solution if you want to concatenate from index 1.

strcat(sub[0],&S[1]);

PS:strcat的签名是

PS: signature of strcat is

char * strcat ( char * destination, const char * source );

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