hextrain.c

定义一个表示三维空间坐标点的类

/**
* @file   hextrain.c
* @brief  hexadecimal convert training
*/

#include <stdio.h>
#include <stdlib.h>

FILE * fp;

void output (int cnt)
{
    int i, j;
    int rnum;
    char  space [8];
    
    srand (time(NULL));
    
    fprintf (fp, "\n DEC   HEX        BIN   OCT\n");
    for (j=0; j<cnt; j++)
    {
        rnum = (float)rand()/RAND_MAX * 256;
        fprintf (fp, " %3d\n",  rnum);
    }

    fprintf (fp, "\n HEX        BIN   OCT   DEC\n");
    for (j=0; j<cnt; j++)
    {
        rnum = (float)rand()/RAND_MAX * 256;
        fprintf (fp, " %02Xh\n", rnum);
    }

    fprintf (fp, "\n OCT        BIN   HEX   DEC\n");
    for (j=0; j<cnt; j++)
    {
        rnum = (float)rand()/RAND_MAX * 256;
        sprintf (space, "0%o", rnum);
        fprintf (fp, "%4s\n", space);
    }
}

int main (int argc, char * argv [])
{
    if ((fp = fopen ("hextrain.txt", "a")) == NULL)
    {
        perror ("Error open hextrain.txt");
        exit (1);
    }

    output (6);
    
    fclose (fp);

    printf ("Append to hextrain.txt over.\n");
    getchar ();
    
    return (0);
}