View Compilation Error

0_0_16212374_14898.cpp: In function 'void getnext(const char*)':
0_0_16212374_14898.cpp:4:2: error: 'nextval' was not declared in this scope
  nextval[0] = -1;
  ^
0_0_16212374_14898.cpp:5:13: error: 'len' was not declared in this scope
  while(i != len)
             ^