我們被要求用 Java 構(gòu)建一個隨機字母庫。我做了功課。我們現(xiàn)在被要求用 C 語言編寫。我用 Java 中的 nanotime 做到了。我做了一些研究，但我在 C 中找不到納米時間。已經(jīng)在 C 中嘗試過：（它沒有用）Random SayiOlustur(){Random this;this = (Random) malloc(sizeof(struct RANDOM));char randomly;int i;struct timeval before , after;gettimeofday(&before , NULL);for (i=1 ; i <= 100 ; i++){   printf("%d %d %d ",i, i*i, i*i*i);}gettimeofday(&after , NULL);printf("%d",Nano(before,after)); int random;double test;while(true){    test = Nano(before,after);    random = (int)test % (int)123.0;    if((random >= 65 && random <= 90) || (random >= 97 && random <= 122)){    randomly = (char) random;    break;    }}}int Nano(struct timeval x,struct timeval y){    double x_ms , y_ms , diff;    x_ms = (double)x.tv_sec*1000000 + (double)x.tv_usec;    y_ms = (double)y.tv_sec*1000000 + (double)y.tv_usec;    diff = (double)y_ms - (double)x_ms;    return diff;}Java代碼：（工作） private long Now(){        long now = System.nanoTime();        return now; }public char Random(){        char rastgele;        while(true){            random = (int)((Now())%123);            // ASCI            if((random >= 65 && random <= 90) || (random >= 97 && random <= 122))                break;        }        rastgele = (char) random;        return rastgele;    }public static void main(String[] args) {        RastgeleKarakter rastgele = new RastgeleKarakter();        System.out.println("Rastgele Karakter: " + rastgele.Random());}出去：run:Rastgele Karakter: m \\ Random出去：runRastgele Karakter: y \\ Random