警告的含义 [英] Meaning of the warning
问题描述
大家好，
我对代码有一个问题。
#include< stdio.h>
char * f1（void ）;
char * f1（无效）
{
char * abc =" Hello" ;;
返回abc;
}
int main（无效）
{
char * p;
p = f1（）;
printf（"％s \ n"，p）;
返回0;
}
编译上面提到的程序如下所述我得到了
意思是
$ gcc -W -Wall -ansi -pedantic -Wformat-nonliteral -Wcast-align -
Wpointer-arith -Wbad-function-cast -Wmissing-prototypes -Wstrict-
原型-Wmissing-declarations -Winline -Wundef -Wnested-externs -
Wcast-qual -Wshadow -Wconversion -Wwrite-strings -ffloat-store -O2
jj。 c $ / $
jj.c：在函数`f1''：
jj.c：5：警告：初始化从指针中丢弃限定符
target类型
我有两个问题
1）警告的含义是什么？
2）返回本地指针值是否安全（即返回abc;）
正确吗？
我的理解是我们不应该返回本地
变量的地址。所以上面的代码可能总是没有工作。
问候，
Somenath
Hi All,
I have one question regarding the code.
#include<stdio.h>
char *f1(void);
char *f1(void)
{
char *abc ="Hello";
return abc;
}
int main(void )
{
char *p;
p = f1();
printf("%s\n", p);
return 0;
}
While compiling the above program as mentioned below I am getting the
meaning
$ gcc -W -Wall -ansi -pedantic -Wformat-nonliteral -Wcast-align -
Wpointer-arith -Wbad-function-cast -Wmissing-prototypes -Wstrict-
prototypes -Wmissing-declarations -Winline -Wundef -Wnested-externs -
Wcast-qual -Wshadow -Wconversion -Wwrite-strings -ffloat-store -O2
jj.c
jj.c: In function `f1'':
jj.c:5: warning: initialization discards qualifiers from pointer
target type
I have two question
1) What is the meaning of the warning ?
2) is it safe to return the local pointer value (i.e return abc ;) is
correct ?
My understanding is we should not return address of local
variable .So above code may not be working always .
Regards,
Somenath
推荐答案
gcc -W -Wall -ansi -pedantic -Wformat-nonliteral -Wcast-align -
Wpointer-arith -Wbad-function-cast -Wmissing-prototypes -Wstrict-
原型-Wmissing-declarations -Winline -Wundef -Wnested-externs -
Wcast-qual -Wshadow -Wconversion -Wwrite-strings -ffloat-store -O2
jj.c
jj.c：在函数`f1''：
jj.c：5：警告：初始化从指针中丢弃限定符
目标类型
我有两个问题
1）警告的含义是什么？
2）r是否安全eturn本地指针值（即返回abc;）是
正确吗？
我的理解是我们不应该返回本地地址
变量。以上代码可能无法正常工作。
问候，
Somenath
gcc -W -Wall -ansi -pedantic -Wformat-nonliteral -Wcast-align -
Wpointer-arith -Wbad-function-cast -Wmissing-prototypes -Wstrict-
prototypes -Wmissing-declarations -Winline -Wundef -Wnested-externs -
Wcast-qual -Wshadow -Wconversion -Wwrite-strings -ffloat-store -O2
jj.c
jj.c: In function `f1'':
jj.c:5: warning: initialization discards qualifiers from pointer
target type
I have two question
1) What is the meaning of the warning ?
2) is it safe to return the local pointer value (i.e return abc ;) is
correct ?
My understanding is we should not return address of local
variable .So above code may not be working always .
Regards,
Somenath
somenath< so ********* @ gmail.comwrites：
somenath <so*********@gmail.comwrites:
#include< stdio.h>
char * f1（void）;
char * f1（void）
{
char * abc =" Hello" ;;
返回abc;
}
int main（无效）
{
char * p;
p = f1（）;
printf（"％s \ n"，p）;
返回0;
}
编译上面提到的程序如下所述我得到了
意思
#include<stdio.h>
char *f1(void);
char *f1(void)
{
char *abc ="Hello";
return abc;
}
int main(void )
{
char *p;
p = f1();
printf("%s\n", p);
return 0;
}
While compiling the above program as mentioned below I am getting the
meaning
gcc -W -Wall -ansi -pedantic -Wformat-nonliteral -Wcast-align -
Wpointer-arith -Wbad-functi on-cast -Wmissing-prototypes -Wstrict-
原型-Wmissing-declarations -Winline -Wundef -Wnested-externs -
Wcast-qual -Wshadow -Wconversion -Wwrite- strings -ffloat-store -O2
jj.c
jj.c：函数`f1''：
jj.c：5 ：警告：初始化从指针中丢弃限定符
目标类型
我有两个问题
1）这是什么意思警告 ？
gcc -W -Wall -ansi -pedantic -Wformat-nonliteral -Wcast-align -
Wpointer-arith -Wbad-function-cast -Wmissing-prototypes -Wstrict-
prototypes -Wmissing-declarations -Winline -Wundef -Wnested-externs -
Wcast-qual -Wshadow -Wconversion -Wwrite-strings -ffloat-store -O2
jj.c
jj.c: In function `f1'':
jj.c:5: warning: initialization discards qualifiers from pointer
target type
I have two question
1) What is the meaning of the warning ?
可能与char的签名和
签名的Hello有关吗？ />
Asbj ?? rn
May it have anything to do with the signed-ness of char and the
signed-ness of "Hello"?
Asbj??rn
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