firinput.cpp

来自「fir的c语言程序」· C++ 代码 · 共 24 行

#include "stdio.h"
#include "stdlib.h"
#include "math.h"
#define  PI 3.14159265
void main(void)
{
  int i;
  double f[256];
  FILE *fp;
  if((fp = fopen("firinput","wb")) == NULL)
  {
    printf("Can't open file!\n");
    exit(0);
  }
  fprintf(fp,"input_data\n");
  for(i=0;i<=255;i++)
  {
    f[i] = (cos(2*PI*i*1000/8000)+cos(2*PI*i*2500/8000))/4;
    fprintf(fp,"    .word        %ld\n",(long)(f[i]*16384));
    
  }
  fclose(fp);
}