View Compilation Error

0_0_31138725_23517.cpp:17:11: error: expected identifier before '(' token
 void union(int x,int y)
           ^
0_0_31138725_23517.cpp:17:12: error: expected unqualified-id before 'int'
 void union(int x,int y)
            ^
0_0_31138725_23517.cpp:17:12: error: expected ')' before 'int'
0_0_31138725_23517.cpp: In function 'int main()':
0_0_31138725_23517.cpp:35:7: error: expected primary-expression before 'union'
       union(x,y);
       ^