[已解决]函数声明的作用域

jackz007

          确实，VC都可以，但是 gcc 不灵
        【tdm-gcc 5.1.0】：

1. D:\[00.Exerciese.2022]\C>g++ -o x x.c
   
2. x.c:3:11: error: '::main' must return 'int'
   
3. void main()
   
4.            ^
   
5. x.c: In function 'int test()':
   
6. x.c:15:18: error: 'max' was not declared in this scope
   
7.          c=max(a,b);
   
8.                   ^
   
9. 
   
10. D:\[00.Exerciese.2022]\C>

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        【vc6.0】：

1. D:\[00.Exerciese.2022]\C>cl x.c
   
2. Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8804 for 80x86
   
3. Copyright (C) Microsoft Corp 1984-1998. All rights reserved.
   
4. 
   
5. x.c
   
6. Microsoft (R) Incremental Linker Version 6.00.8447
   
7. Copyright (C) Microsoft Corp 1992-1998. All rights reserved.
   
8. 
   
9. /out:x.exe
   
10. x.obj
    
11. 
    
12. D:\[00.Exerciese.2022]\C>

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        【vc9.0】：

1. D:\[00.Exerciese.2022]\C>cl x.c
   
2. 用于 80x86 的 Microsoft (R) 32 位 C/C++ 优化编译器 15.00.30729.01 版
   
3. 版权所有(C) Microsoft Corporation。保留所有权利。
   
4. 
   
5. x.c
   
6. Microsoft (R) Incremental Linker Version 9.00.30729.01
   
7. Copyright (C) Microsoft Corporation.  All rights reserved.
   
8. 
   
9. /out:x.exe
   
10. x.obj
    
11. 
    
12. D:\[00.Exerciese.2022]\C>

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