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View Compilation Error

0_0_27709305_16352.cpp:6:11: error: '::main' must return 'int'
 void main(){
           ^
0_0_27709305_16352.cpp: In function 'int main()':
0_0_27709305_16352.cpp:8:23: error: invalid user-defined conversion from 'std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}' to 'const char*' [-fpermissive]
     while(scanf(cin>>x>>y) 
                       ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:44:0,
                 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_27709305_16352.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_ios.h:115:7: note: candidate is: std::basic_ios<_CharT, _Traits>::operator void*() const [with _CharT = char; _Traits = std::char_traits<char>] <near match>
       operator void*() const
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_ios.h:115:7: note:   no known conversion from 'void*' to 'const char*'
0_0_27709305_16352.cpp:9:1: error: expected ')' before 'cout'
 cout<<x*y/Gcd(x,y)<<endl;
 ^


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