View Compilation Error

0_0_19707126_3259.cpp: In function 'int main()':
0_0_19707126_3259.cpp:51:15: error: expected ')' before ';' token
  while(int i=n;i>=1;i--)
               ^
0_0_19707126_3259.cpp:51:16: error: 'i' was not declared in this scope
  while(int i=n;i>=1;i--)
                ^