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#include <stdio.h>
#include <vector>
#define DPI (2*M_PI)
using namespace std;
vector<double> Re;// [出力] 実数部
vector<double> Im;// [出力] 虚数部
void dft(MONO_PCM pcm,size_t st, size_t ed)
{
    // dft
    int N = ed-st;
    int* a = &pcm.s[st];
    Re.clear();
    Im.clear();
    for( int fq=0; fq<NN; fq++ )
    {
        double Re_sum = 0;
        double Im_sum = 0;
        for( int i=0; i<NN; ++i){
            double tht = DPI*fq*i/N;
            Re_sum += a[i] *  cos( tht );
            Im_sum += a[i] * -sin( tht );
        }
        Re.push_back( Re_sum );
        Im.push_back( Im_sum );
    }
    return;
}
void idft(MONO_PCM& pcm,size_t N)
{
    for( int fq=0; fq<N; fq++ )
    {
        double Re_sum = 0;
        double Im_sum = 0;
        for( int i=0; i<N; ++i){
            double tht = DPI*fq*i/N;
            Re_sum +=  Re[i] * cos(tht)
                      -Im[i] * sin(tht);
            Im_sum +=  Re[i] * sin(tht)
                      +Im[i] * cos(tht);
        }
        pcm.s.push_back(Re_sum/N);
    }
    return;
}
 

prog.cpp:7:10: error: variable or field 'dft' declared void
 void dft(MONO_PCM pcm,size_t st, size_t ed)
          ^
prog.cpp:7:10: error: 'MONO_PCM' was not declared in this scope
prog.cpp:7:30: error: expected primary-expression before 'st'
 void dft(MONO_PCM pcm,size_t st, size_t ed)
                              ^
prog.cpp:7:41: error: expected primary-expression before 'ed'
 void dft(MONO_PCM pcm,size_t st, size_t ed)
                                         ^

Standard output is empty