View Compilation Error

0_0_32347041_19785.cpp: In function 'int main()':
0_0_32347041_19785.cpp:22:13: error: redeclaration of 'int n'
  int n,unit,n=0;
             ^
0_0_32347041_19785.cpp:22:6: note: 'int n' previously declared here
  int n,unit,n=0;
      ^