View Compilation Error

0_0_36451861_28834.cpp: In function 'int minval()':
0_0_36451861_28834.cpp:9:22: error: 'n' was not declared in this scope
   for(int len=1;len<=n;len++){
                      ^
0_0_36451861_28834.cpp:22:17: error: 'n' was not declared in this scope
  for(int i=1;i<=n;i++){
                 ^