Function approx

contents/cooley_tukey/code/c/fft.c:97–105

}

void approx(double complex *X, double complex *Y, size_t N) {
    for (size_t i = 0; i < N; ++i) {
        if (cabs(X[i]) - cabs(Y[i]) > 1E-5) {
            printf("This is not approximate.\n");
            return;
        }
    }
    printf("This is approximate.\n");
}

int main() {
    srand((unsigned int)time(NULL));