View Compilation Error

0_0_18297976_31708.cpp: In function 'void roll(int*, int*, int*, int, int)':
0_0_18297976_31708.cpp:74:16: error: cannot convert 'int*' to 'cpx*' for argument '1' to 'void fft(cpx*, int, int)'
  fft(a, num, -1);
                ^