阅读以下说明和C函数，将应填入（n）处的字句写在答题纸的对应栏内。
【说明】
某单位准备进行一次选举，对指定的n名（n＜80）候选人进行投票。为了简化选举工作，事先印制了写有这n名候选人姓名的选票，投票者只需将选中者名下的圆圈涂黑即可。规定每张选票上被涂黑的圆圈数不得超过3个，也不得少于1个，否则视为无效选票。投票结束后，所有选票经计算机扫描处理，形成了描述选票状态的文本文件。例如，
n=8时所形成的文件如下：
01011000
10010100
10011000
11111111
00000000
00111000
……
其中，每行表示一张选票的数据，每列代表一位候选者的得票情况。第i行第j列为1，表示第i张选票上投了第j名候选人1票。
函数statistic（）的功能是读入选票数据，并统计每位候选者的得票数，函数返回有效选票数。
【C函数】
int statistic (FILE *fp，int candidate[ ]，int n)
｛ /* 从文件中读入选票数据，n为候选人数量(n＜80)，从有效选票中统计每位候选者
的得票数并存入candidate[]，函数返回有效选票数 */
char str[80] /* str保存读入的一张选票数据 */
int I tag=0 /* tag用于判断每张选票是否有效 */
int q=0 /* q用于计算有效选票数 */
for（i=0：i＜n; i++）
candidate[i]=0；
while（ (1) ）｛
fgets（str， 80， fp）：/* 读入一张选票数据 */
for（tag=0， i=0 ; （(2)） ；i++）
if (str[i] = = ’1 ’) tag++；
if（(3)）｛/* 若是有效选票，则进行统计 */
( (4) );
for(i=0；i＜n；i++)
if（str[i]= =‘1’）（5） ；
｝
｝
return q；
｝ /* statistic */
正确答案及解析
正确答案
解析
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