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 #include <iostream>
2    using namespace std;
3    int a=5;
4    int b=2;
5    void add()
6    {
7    int sum;
8    sum = a + b;
9    cout <<"Sum of a and b is "<<sum<<"\n";
10  }
11  int main()
12  {
13  add;
14  return 0;
15  }

prog.cpp:2:1: error: expected unqualified-id before numeric constant
 2    using namespace std;
 ^
prog.cpp:3:1: error: expected unqualified-id before numeric constant
 3    int a=5;
 ^
prog.cpp:4:1: error: expected unqualified-id before numeric constant
 4    int b=2;
 ^
prog.cpp:5:1: error: expected unqualified-id before numeric constant
 5    void add()
 ^
prog.cpp:11:1: error: expected unqualified-id before numeric constant
 11  int main()
 ^

Standard output is empty