View Compilation Error

0_0_24530068_32240.cpp: In function 'long long int solve(long long int)':
0_0_24530068_32240.cpp:41:11: error: 'i' was not declared in this scope
  if(digit[i]==9&&digit[i+1]==4)
           ^
0_0_24530068_32240.cpp:42:2: error: break statement not within loop or switch
  break;
  ^