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char *s与char s[]的差异

2012-07-24 
char *s与char s[]的区别#includestdio.h#includestring.hint main(){char *smy name is xc.memse

char *s与char s[]的区别
#include<stdio.h>
#include<string.h>


int main()
{
char *s="my name is xc.";  
   
memset(s,'a',6);
printf("second s:%s\n",s);

return 0;

}
运行出错!为什么char *s="my name is xc."; 必需要改成char s[]="my name is xc.";才能通过?

[解决办法]
s 是常量~~
[解决办法]
s指向常量字符串,这部分内存空间是不可修改的。
s[]后,s指向的空间是栈空间,是可以修改的。
[解决办法]

C/C++ code
int main(){char *s="my name is xc.";  // s所指向的空间是只读的,所以不能修改   memset(s,'a',6);printf("second s:%s\n",s);return 0;}
[解决办法]
楼上正解 啊 

[解决办法]
探讨

s指向常量字符串,这部分内存空间是不可修改的。
s[]后,s指向的空间是栈空间,是可以修改的。

[解决办法]
来晚了
[解决办法]
xucheng_njupt
(xucheng_njupt)
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[解决办法]
这应该就是指针和数组的区别。指针存放的是字符串的地址,而字符串常量存放在只读数据段里,所以对其对其写操作是非法的。而数组是在栈上申请空间,把字符串常量拷贝到栈上的数组空间里。栈上的空间是可以读写的,所以可以通过,并能够正常运行。
[解决办法]
[Quote=引用:]
s指向常量字符串,这部分内存空间是不可修改的。
s[]后,s指向的空间是栈空间,是可以修改的。
正解...
[解决办法]

探讨

s指向常量字符串,这部分内存空间是不可修改的。
s[]后,s指向的空间是栈空间,是可以修改的。

[解决办法]
char *s="abc"
char s[]="abc"
的区别在于*s是指针,他指向的地方是常量区,不能修改字符的内容
s[]是字符数组,他是初始化为"abc",所以里面的字符能修改
[解决办法]
探讨

s指向常量字符串,这部分内存空间是不可修改的。
s[]后,s指向的空间是栈空间,是可以修改的。

[解决办法]
全局变量或加static前缀的话,char s[]="abc";中的abc在内存段.data中而不是在栈中。
char *s="abc";中的abc在内存段.rdata中,默认不可写,若强行写会导致内存保护中断。
如果在代 码开头加#pragma comment(linker,"/SECTION:.rdata,RW")则可以让.rdata段可写,不过这样做风险自负。

[解决办法]
char *s="my name is xc."; 这样初始化,字符串存在常量区,不能修改,也不能释放。

[解决办法]
探讨
全局变量或加static前缀的话,char s[]="abc";中的abc在内存段.data中而不是在栈中。
char *s="abc";中的abc在内存段.rdata中,默认不可写,若强行写会导致内存保护中断。
如果在代 码开头加#pragma comment(linker,"/SECTION:.rdata,RW")则可以让.rdata段可写,不过这样做风险自负。

[解决办法]
++
探讨
s指向常量字符串,这部分内存空间是不可修改的。
s[]后,s指向的空间是栈空间,是可以修改的。

[解决办法]
探讨


xucheng_njupt
(xucheng_njupt)
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