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# #include <iostream>
# using namespace std;
# int a, b;
# int main()
# {
# cin >> a;
# cin>>b;
# cout<<a;
# cout<<b;
#
# return 0;
# }

prog.cpp:1:3: error: invalid preprocessing directive ##
 # #include <iostream>
   ^
prog.cpp:2:3: error: invalid preprocessing directive #using
 # using namespace std;
   ^
prog.cpp:3:3: error: invalid preprocessing directive #int
 # int a, b;
   ^
prog.cpp:4:3: error: invalid preprocessing directive #int
 # int main()
   ^
prog.cpp:5:3: error: invalid preprocessing directive #{
 # {
   ^
prog.cpp:6:3: error: invalid preprocessing directive #cin
 # cin >> a;
   ^
prog.cpp:7:3: error: invalid preprocessing directive #cin
 # cin>>b;
   ^
prog.cpp:8:3: error: invalid preprocessing directive #cout
 # cout<<a;
   ^
prog.cpp:9:3: error: invalid preprocessing directive #cout
 # cout<<b;
   ^
prog.cpp:11:3: error: invalid preprocessing directive #return
 # return 0;
   ^
prog.cpp:12:3: error: invalid preprocessing directive #}
 # }
   ^

Standard output is empty