生成随机数的问题

static int j;
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{
e*N~$u rE-D [0        int itera_num,rand_num,i,j;51Testing软件测试网O^Qi.o?
        char StrTable[] ="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
$K&wH(w$x+X9b0        char i_name[15]="";
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j/g0g051Testing软件测试网)T6S{
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        srand((unsigned)time(NULL));
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OC0        lr_log_message("srand is %d",srand((unsigned)time(NULL)));51Testing软件测试网1A9y3r,y/G]y
        itera_num=rand()%15;51Testing软件测试网QD5OW*{"dh
        lr_log_message("rand number is %d",itera_num);51Testing软件测试网]X5K,I)O K
        for (i=0;i<=itera_num;i++)
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`4N0                rand_num=rand()%52;51Testing软件测试网%L&^!ptG
                strncat(i_name,StrTable+rand_num,1);51Testing软件测试网
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        }
&Zo Or6y0        j++;
!? n9n*xZ?qPK8a0        lr_log_message("Iteration %d ,the string is %s",j,i_name);
yyuWw%EXr0        return 0;