正弦波问题

翔飞提问时间：2013-1-26 17:10 /

#include
#include
#include
#include "cfg.h"
const char space_tbl[4][6] = {" ", " ", "   ", "    "};
int main(void)
{
    FILE *fp;
#ifdef USE_DEBUG
    FILE *logfile;
#endif
    double tbl[LENGTH];
    char str[6];
    unsigned char num;
    unsigned char cnt;
    unsigned char space_cnt;
    unsigned long j;
    if (LENGTH >= 10000)
    {
        space_cnt = 5;
    }
    else
    {
        if (LENGTH >= 1000)
        {
            space_cnt = 4;
        }
        else
        {
            space_cnt = 3;
        }
    }
#ifdef USE_DEBUG
//    printf("space_cnt = %d\r\n", space_cnt);
    logfile = fopen("log.txt", "w+");
#endif

    for(j = 0; j < LENGTH; j++)
    {
        tbl[j] = PRECISION * sin((j * 2 * PI) / LENGTH);
        tbl[j] += OFFSET;
    }
    fp = fopen("sin.txt", "w+");
    cnt = 0;
    for (j = 0; j < LENGTH; j++)
    {
        num = sprintf(str, "%d, ", (short)(tbl[j] + 0.5));
#ifdef USE_DEBUG
        fprintf(logfile, "cnt %d: %d\r", j, num);
#endif
        if (space_cnt > num - 2)
        {
            fwrite(space_tbl[space_cnt + 2 - num], 1, space_cnt + 2 - num, fp);
        }
        fwrite(str, 1, num, fp);
        cnt ++;
        if (cnt == 16)
        {
            cnt = 0;
            fwrite("\r", 1, 1, fp);
        }
    }
    fclose(fp);
#ifdef USE_DEBUG
    fclose(logfile);
#endif
    Sleep(3000);
    return 0;
}
这是正弦波形数组生成程序生成有2百多个数组我想问下修改哪里可以改变输出数组的个数