文件名称:DES
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DES加密算法的C语言实现。用VC编译是可以的（VC的C编译器和C++编译器是分开的，*.c的文件VC都是用C编译器编译的）。在GCC或者其他编译环境下有可能编译器不认识__int64的写法，这时在文件头加上这么一句应该就可以了：
#ifndef __int64
#define __int64 long long
#endif-DES encryption algorithm in C language. VC compiler (VC C compiler and C++ compiler is a separate,* c file VC C compiler). GCC or any other compiler environment compiler does not know __int64 of writing, this time in the file header with such a one should be:
#ifndef __int64
#define __int64 long long
#endif
#ifndef __int64
#define __int64 long long
#endif-DES encryption algorithm in C language. VC compiler (VC C compiler and C++ compiler is a separate,* c file VC C compiler). GCC or any other compiler environment compiler does not know __int64 of writing, this time in the file header with such a one should be:
#ifndef __int64
#define __int64 long long
#endif
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DES.C