Compilare: user.cpp: In function ‘void rec_fft(complex*, int, int)’: user.cpp:46:37: warning: unused variable ‘j’ [-Wunused-variable] int nr_odd = 0, nr_even = 0, i, j; ^ user.cpp: In function ‘int main()’: user.cpp:86:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d", &T); ^ user.cpp:93:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d", &n); ^ user.cpp:96:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d", &ind); ^ user.cpp:102:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d", &m); ^ user.cpp:105:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d", &ind); ^