初在linux编译C

zengmao

hello.C文件：

1. 
   
2. #include <iostream.h>
   
3. void main (void)
   
4. {
   
5. cout << "Hello ,world!" <<endl;
   
6. }
   

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1. 
   
2. [m@localhost C]$ g++ -o hello hello.C
   
3. In file included from /usr/lib/gcc/i386-redhat-linux/4.1.2/../../../../include/c++/4.1.2/backward/iostream.h:31,
   
4.                  from hello.C:1:
   
5. /usr/lib/gcc/i386-redhat-linux/4.1.2/../../../../include/c++/4.1.2/backward/backward_warning.h:32:2: warning: #warning This file includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.1.2 of the C++ standard. Examples include substituting the <X> header for the <X.h> header for C++ includes, or <iostream> instead of the deprecated header <iostream.h>. To disable this warning use -Wno-deprecated.
   
6. hello.C:2: error: ‘::main’ must return ‘int’
   
7. [m@localhost C]$
   

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根据提示用  -Wno-deprecated.，上面的话到底指的什么意思呀？？？？？

1. [m@localhost C]$ g++  -Wno-deprecated -o hello hello.C
   
2. hello.C:2: error: ‘::main’ must return ‘int’
   
3. [m@localhost C]$
   

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不有错，返回类型已经是void了，为什么还要 must return ‘int’

yangsf5

要遵循标准

1. 
   
2. #include <iostream>
   
3. using namespace std;
   
4. 
   
5. int main()
   
6. {
   
7.     //写你的代码
   
8.     return 0;
   
9. }
   

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[ 本帖最后由 yangsf5 于 2009-3-10 22:02 编辑 ]

zengmao

1. [m@localhost C]$ cat hello.C
   
2. #include <iostream>
   
3. using namespace std;
   
4. int main ()
   
5. {
   
6. cout << "Hello ,world!" <<endl;
   
7. return 0;
   
8. }
   
9. [m@localhost C]$ gcc -o hello hello.C
   
10. /tmp/ccjdqBUO.o: In function `__static_initialization_and_destruction_0(int, int)':
    
11. hello.C:(.text+0x23): undefined reference to `std::ios_base::Init::Init()'
    
12. /tmp/ccjdqBUO.o: In function `__tcf_0':
    
13. hello.C:(.text+0x6c): undefined reference to `std::ios_base::Init::~Init()'
    
14. /tmp/ccjdqBUO.o: In function `main':
    
15. hello.C:(.text+0x8e): undefined reference to `std::cout'
    
16. hello.C:(.text+0x93): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
    
17. hello.C:(.text+0x9b): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
    
18. hello.C:(.text+0xa3): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))'
    
19. /tmp/ccjdqBUO.o:(.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
    
20. collect2: ld returned 1 exit status
    
21. [m@localhost C]$
    

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这又是怎么回事？？？？？？？

MMMIX

C++ 代码用 g++ 编译

zengmao

TKS！！！

yangsf5

补充：
hello.c
---> hello.cpp

zengmao

C是大写的

和cpp一样也能代表C＋＋吧

langue

同学，赶紧换本新的C++教材吧。你用的这本又老又不标准。

yangsf5

恩。。
sorry.
我业务不熟练。。

swxlion

原帖由 langue 于 2009-3-10 23:28 发表
同学，赶紧换本新的C++教材吧。你用的这本又老又不标准。

Nod.