© / Posted in 知识如海 / September 7, 2009
const char * 转换为 char *
指向const的指针不能被赋给指向非const的指针,所以应该用strcpy，也就是另开一块内存，把字符一个个复制过去
const char *expr = "goodidea";
char *buf = new char[strlen(expr)+1];
strcpy(buf, expr);
strcpy(buf, expr);
strcpy
原型：extern char *strcpy(char *dest,char *src);
用法：#include <string.h>
功能：把src所指由NULL结束的字符串复制到dest所指的数组中。
说明：src和dest所指内存区域不可以重叠且dest必须有足够的空间来容纳src的字符串。
返回指向dest的指针。
附：指针常量，常量指针
什么是指针常量？指针常量即指针类型的常量。
例：char *const name1="John";
name1="abc"; //错误，name1指针，不能变，一个指针类型的变量，存放的是地址，所以不能把'"abc"的地址赋给name1
char * name2= name1; //可以
char * name2= name1; //可以
什么是常量指针？常量指针即是指向常量的指针，指针的值可以改变，指针所指的地址中的内容为常量不能改变，
例：const char *name1="John";
char s[]="abc"; name1=s; //正确，name1存放的地址可以改变
char * name2= name1; //不可以，因为name2 和 name1存放的是同一块地址，如果name2地址中的内容改了，则name1的内容也改了，那么name1就不再是指向常量的指针了。
char * name2= name1; //不可以，因为name2 和 name1存放的是同一块地址，如果name2地址中的内容改了，则name1的内容也改了，那么name1就不再是指向常量的指针了。
一句话，靠近哪个哪个不能改变！
不懂 -----------------
我闪
俺是不是也应该好好学习学习c++了
门外汉
@就是不填
@仁心博客
呵呵，用不着的话就不用懂啊
阅读，并送ip。
O(∩_∩)O~完全不懂
我觉得我对这个很了解。
const char * 是 const char 的指针，指针的本身是可变的，指向的对象是不可变的。
char const * 是 char 的指针，指针的本身是常量，在定义后就不可以指向另外的对象（当然有一种方法可以的），但是指向的对象是可变的。
建议博主去了解一下 static_cast，它可以做到这些事情（如果我没有记错）：
char *p = new char[256];
const char *q = p;
char *fake = static_cast(q);
fake[0] = 'a';
// ...
@Euyuil, 指针常量和常量指针在文中也有说明了~~而你所说的static_cast是C++的强制类型转换，文中的是C的
你博客把我的大于号和小于号屏蔽了，上面的某行改成：
char *fake = static_cast＜char *＞(q);
我只能用中文符号代替……
麻烦了……C和C++我已经不分了……
@Euyuil, 呵呵，要求不严格，自己写些小程序的时候，不分也无所谓~~只要支持就行~~
对了……不应该是static_cast，应该是const_cast，太顺手……
我
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