反向C型字符串？ - C ++ [英] Reverse C-style String? - C++

问题描述

我想使用指针来反转C ++中的char数组。我想知道是否有什么我应该做不同？我这样做正确吗？有没有更有效的方法来完成这个？

我的小程式：

  int main（）
 {
 char buffer [80]; 
 
 PrintHeader（）; 
 
 cout<< \\\
String reversal program; 
 cout<< \\\
Type in a short string of words。; 
 cout<< \ n我会扭转他们。 
 cout<< \\\
：; 
 cin.getline（buffer，79）; 
 
 cout<< \\\
You typed<<缓冲; 
 reverse（buffer）; 
 cout<< \\\
Reversed：<<缓冲; 
 
 cout<< endl 
 system（PAUSE）; 
 return 0; 
 
} 
 
 
 void reverse（char * string）
 {
 char * pStart，* pEnd; 
 int length; 
 char temp; 
 
 length = strlen（字符串）; 
 
 pStart = string; 
 pEnd =& string [length  -  1]; 
 
 while（pStart< pEnd）
 {
 temp = * pStart; 
 * pStart = * pEnd; 
 * pEnd = temp; 
 pStart ++; 
 pEnd--; 
} 
} 
  

解决方案

p> void str_reverse（char * str）{
char * str_end = strchr（str，0）;
std :: reverse（str，str_end）;
}


如果你应该写一个循环，

  void str_reverse（char * str）{
 std :: size_t len = std :: strlen（str）; 
 for（std :: size_t index = 0; index！= len / 2; ++ index）{
 std :: swap（str [index]，str [len  -  index  -  1]）; 
} 
} 
  

当然，如果你可以使用C ++字符串，

  void str_reverse（std :: string& str）{
 std :: reverse（str.begin （），str.end（））; 
} 
  

I want to use pointers to reverse a char array in C++. I was wondering if there is anything that I should do differently? Am I doing this correctly? Is there a more efficient way to accomplish this?

My small program:

int main ( )
{
    char buffer[80];

    PrintHeader();

    cout << "\nString reversal program";
    cout << "\nType in a short string of words.";
    cout << "\nI will reverse them.";
    cout << "\n:";
    cin.getline(buffer, 79);

    cout << "\nYou typed " << buffer;
    reverse (buffer);
    cout << "\nReversed: " << buffer;

    cout << endl;
    system("PAUSE");
    return 0;

}


void reverse(char* string)
{
    char* pStart, *pEnd;
    int length;
    char temp;

    length = strlen(string);

    pStart = string;
    pEnd = &string[length - 1];

    while(pStart < pEnd)
    {
        temp = *pStart;
        *pStart = *pEnd;
        *pEnd = temp;
        pStart++;
        pEnd--;
    }
}

解决方案

void str_reverse( char *str ) {
    char *str_end = strchr( str, 0 );
    std::reverse( str, str_end );
}

if you're supposed to write a loop,

void str_reverse( char *str ) {
    std::size_t len = std::strlen( str );
    for ( std::size_t index = 0; index != len / 2; ++ index ) {
        std::swap( str[ index ], str[ len - index - 1 ] );
    }
}

or, of course, if you can use a C++ string,

void str_reverse( std::string &str ) {
    std::reverse( str.begin(), str.end() );
}

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