我会得到内存泄漏.. [英] will I get Memory leak..
问题描述
大家好，
void main（）
{
char * fp;
fp = malloc（26）;
strcpy（fp，" ABCDEFGHIJKLMNOPQRSTUVWXYZ"）;
fp [10] =''\ 0'';
免费（fp）;
}
请参考我的问题程序..
1.任何人都可以告诉我，如果我在中间分配''\0''
动态分配的内存区域我会得到内存泄漏.. ??
2。将免费（）删除由
动态分配的所有内存，即使在其中间添加了NULL值。??
3.我怎么知道这会导致内存泄漏一个程序??任何
编译器选项都有？我可以使用夹板工具吗？
谢谢，
Ganesh
gNash< ga ********** @ gmail.comwrote：
void main（）
这是错误的。它应该是
int main（）
或优先选择，
int main（ void）
{
char * fp;
fp = malloc（26）;
strcpy（fp，" ABCDEFGHIJKLMNOPQRSTUVWXYZ"）;
这是错误的。你复制了27个字符（一个整个字母，加上
终止空字符）到空间，只能容纳26个字节。
fp [ 10] =''\ 0'';
free（fp）;
然而，这些都绝对没问题，并且应该没有问题
一旦你修复了它们上面的行中的错误。
}
Richard
11月14日下午12:31，gNash< ganeshamu ... @ gmail.comwrote：
大家好，
void main（）
{
char * fp;
fp = malloc（26）;
strcpy（fp，" ABCDEFGHIJKLMNOPQRSTUVWXYZ"）;
fp [10] =''\ 0'';
免费（fp）;
}
请参考我的问题程序..
1.任何人都可以告诉我，如果我指定''\\ \\ /''中间的
动态分配的内存区域会让内存泄漏.. ??
2。将免费（）删除由
动态分配的所有内存，即使在其中间添加了NULL值。??
3.我怎么知道这会导致内存泄漏一个程序??任何
编译器选项都有？我可以使用夹板工具吗？
Richard Bos回答了你的主要问题。我将简单地将
添加为值为0的字符称为NUL而不是
NULL。为了检测内存泄漏，valgrind享有良好的声誉。
11月14日下午5:34，r ... @ hoekstra-uitgeverij.nl（Richard Bos）写道：
gNash< ganeshamu ... @ gmail.comwrote：
void main （）
这是错误的。它应该是
int main（）
或优先选择，
int main（ void）
{
char * fp;
fp = malloc（26）;
strcpy（fp，" ABCDEFGHIJKLMNOPQRSTUVWXYZ"）;
这是错误的。你复制了27个字符（一个整个字母，加上
终止空字符）到空间，只能容纳26个字节。
fp [ 10] =''\ 0'';
free（fp）;
然而，这些都绝对没问题，并且应该没有问题
一旦你修复了它们上面的行中的错误。
}
Richard
嗨理查德..
int main（无效）和malloc（26 + 1）我不怀疑我的怀疑
被清楚地发布..请回复。
感谢你，
Hi all,
void main()
{
char *fp;
fp=malloc(26);
strcpy(fp,"ABCDEFGHIJKLMNOPQRSTUVWXYZ");
fp[10]=''\0'';
free(fp);
}
Please refer the program for my questions..
1. Can any one tell me if would i assign ''\0'' at middle of
dynamically assigned memory area will i get memory leak.. ??
2 . Will "free()" delete all the memory which allocated by
dynamically even NULL values has been added in middle of that.??
3. How let i know that will i get memory leak in a program?? any
compiler option are there ?? Can i use splint tool ?
Thanks,
Ganesh
gNash <ga**********@gmail.comwrote:
void main()This is wrong. It should be
int main()
or by preference,
int main(void)
{
char *fp;
fp=malloc(26);
strcpy(fp,"ABCDEFGHIJKLMNOPQRSTUVWXYZ");This is wrong. You copy 27 characters (one whole alphabet, plus the
terminating null character) into space which can only hold 26 bytes.
fp[10]=''\0'';
free(fp);These, however, are both absolutely fine, and should cause no problems
whatsoever, once you fix the bugs in the lines above them.
}Richard
On Nov 14, 12:31 pm, gNash <ganeshamu...@gmail.comwrote:Hi all,
void main()
{
char *fp;
fp=malloc(26);
strcpy(fp,"ABCDEFGHIJKLMNOPQRSTUVWXYZ");
fp[10]=''\0'';
free(fp);
}
Please refer the program for my questions..
1. Can any one tell me if would i assign ''\0'' at middle of
dynamically assigned memory area will i get memory leak.. ??
2 . Will "free()" delete all the memory which allocated by
dynamically even NULL values has been added in middle of that.??
3. How let i know that will i get memory leak in a program?? any
compiler option are there ?? Can i use splint tool ?Richard Bos has answered your main questions. I will simply
add that the character with value 0 is referred to as NUL not
NULL. For detecting memory leaks valgrind has a good reputation.
On Nov 14, 5:34 pm, r...@hoekstra-uitgeverij.nl (Richard Bos) wrote:gNash <ganeshamu...@gmail.comwrote:void main()
This is wrong. It should be
int main()
or by preference,
int main(void)
{
char *fp;
fp=malloc(26);
strcpy(fp,"ABCDEFGHIJKLMNOPQRSTUVWXYZ");
This is wrong. You copy 27 characters (one whole alphabet, plus the
terminating null character) into space which can only hold 26 bytes.
fp[10]=''\0'';
free(fp);
These, however, are both absolutely fine, and should cause no problems
whatsoever, once you fix the bugs in the lines above them.
}
Richard
Hi Richard..
the int main(void) and malloc(26+1) it is not my doubt my doubts
are posted clearly.. Please reply for it.
Thankingyou,
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