e****d
发帖数: 333 | 1 进入未名形象秀
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发信人: everid (everid), 信区: Programming
标 题: 一道C++习题求解。
发信站: BBS 未名空间站 (Thu Feb 26 00:32:25 2009)
Without including a header file, declare the function puts() from the
Standard C Library. Call this function from main().
我写：
//main.cpp
namespace std{
int puts(const char*);
}
main(){
using namespace std;
puts("h");
}
>g++ main.cpp
报错：
In function `main': undefined reference to `std::puts(char const*)'
怎么回事呢？ | t****t
发帖数: 6806 | 2 this is C function, so you must declare it as
extern "C" int puts(const char *);
alternatively, use C compiler (gcc) and change the file name to .c as
opposed to .cpp
I think the question explicitly said "standard c library". use c++ here is
画蛇添足.
【在 e****d 的大作中提到】
: 进入未名形象秀
: 我的博客
:
: [回复文章] [回信给作者] [本篇全文] [进入讨论区] [返回顶部] [修改文章] [删除
: 文章] [转寄] [转贴] [ 1 ]
: 发信人: everid (everid), 信区: Programming
: 标 题: 一道C++习题求解。
: 发信站: BBS 未名空间站 (Thu Feb 26 00:32:25 2009)
: Without including a header file, declare the function puts() from the
: Standard C Library. Call this function from main().
| e****d
发帖数: 333 | 3 Thank you very much.
the problem is solved exactly as what you said.
I use gcc instead of g++, use .c instead of .cpp, use extern declaration
instead of namesapce. So in general, i switch from c++ to c and the problem
is solved.
【在 t****t 的大作中提到】
: this is C function, so you must declare it as
: extern "C" int puts(const char *);
: alternatively, use C compiler (gcc) and change the file name to .c as
: opposed to .cpp
: I think the question explicitly said "standard c library". use c++ here is
: 画蛇添足.
|
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