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View Compilation Error

0_0_20699034_30461.cpp:2:6: error: expected nested-name-specifier before '&' token
 using namespace std;  
      ^
0_0_20699034_30461.cpp:2:21: error: expected identifier before '&' token
 using namespace std;  
                     ^
0_0_20699034_30461.cpp:2:26: error: expected constructor, destructor, or type conversion before ';' token
 using namespace std;  
                          ^
0_0_20699034_30461.cpp:2:27: error: 'std' does not name a type
 using namespace std;  
                           ^
0_0_20699034_30461.cpp:2:36: error: expected constructor, destructor, or type conversion before ';' token
 using namespace std;  
                                    ^
0_0_20699034_30461.cpp:2:42: error: expected constructor, destructor, or type conversion before ';' token
 using namespace std;  
                                          ^
0_0_20699034_30461.cpp:3:5: error: 'nbsp' declared as reference but not initialized
 int gcd(int a,int b)  
     ^
0_0_20699034_30461.cpp:3:22: error: expected ')' before ';' token
 int gcd(int a,int b)  
                      ^
0_0_20699034_30461.cpp:3:22: error: expected constructor, destructor, or type conversion before ';' token
0_0_20699034_30461.cpp:3:23: error: 'a' does not name a type
 int gcd(int a,int b)  
                       ^
0_0_20699034_30461.cpp:3:34: error: 'b' does not name a type
 int gcd(int a,int b)  
                                  ^
0_0_20699034_30461.cpp:3:47: error: expected constructor, destructor, or type conversion before ';' token
 int gcd(int a,int b)  
                                               ^
0_0_20699034_30461.cpp:4:1: error: expected unqualified-id before '{' token
 {return b==0? a:gcd(b,a%b); }  
 ^
0_0_20699034_30461.cpp:4:50: error: expected constructor, destructor, or type conversion before ';' token
 {return b==0? a:gcd(b,a%b); }  
                                                  ^
0_0_20699034_30461.cpp:4:56: error: expected constructor, destructor, or type conversion before ';' token
 {return b==0? a:gcd(b,a%b); }  
                                                        ^
0_0_20699034_30461.cpp:5:5: error: redefinition of 'int& nbsp'
 int main()  
     ^
0_0_20699034_30461.cpp:3:5: note: 'int& nbsp' previously declared here
 int gcd(int a,int b)  
     ^
0_0_20699034_30461.cpp:5:17: error: expected constructor, destructor, or type conversion before 'nbsp'
 int main()  
                 ^
0_0_20699034_30461.cpp:5:27: error: expected constructor, destructor, or type conversion before ';' token
 int main()  
                           ^
0_0_20699034_30461.cpp:6:1: error: expected unqualified-id before '{' token
 {  
 ^


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