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View Compilation Error

0_0_15022769_30042.cpp: In function 'int main()':
0_0_15022769_30042.cpp:7:14: error: too few arguments to function 'int scanf(const char*, ...)'
  while(scanf()){
              ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/locale.h:12:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/clocale:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/c++locale.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/localefwd.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_15022769_30042.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/stdio.h:386:15: note: declared here
   int __cdecl scanf(const char * __restrict__ _Format,...) __MINGW_ATTRIB_DEPRECATED_SEC_WARN;
               ^
0_0_15022769_30042.cpp:11:25: error: 'memset' was not declared in this scope
   memset(r, 0, sizeof(r));
                         ^


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