#include<stdio.h>
#include<stdlib.h>
#include<math.h>
int main()
{
    FILE* mywav=fopen("/dev/dsp","w");
    double mysou;
    int i;
    for(i=0;1;i++)
    {
        mysou=50*sin(2*3.14*(i+20)*((double)i/800000.0));
        fprintf(mywav,"%c",(char)(mysou+128));
    }
    return 0;
}