[职称英语等级考试模拟题理工类ＡＢ级]第1部分 词汇 选择（第1-15题，每题1分，共15分，建议10分钟以内完成）下面共有15句子，每个句子均有一个词或短语划有底横线，请从每个句子后面所给的四个选项中选择一个与划线部分意义...+阅读
★题目71
函数readdat()实现从文件in.dat中读取20行数据存放到字符串数组xx中（每行字符串长度均小于80）。请编制函数jssort()，其函数的功能是：以行为单位对字符串按给定的条件进行排序，排序后的结果仍按行重新存入字符串数组xx中，后调用函数writedat()把结果xx输出到文件out.dat中。
条件：从字符串中间一分为二，左边部分按字符的ascii值降序排序，右边部分按字符的ascii值升序排序。如果原字符串长度为奇数，则中间的字符不参加排序，字符仍放在原位置上。
例如：位置 0 1 2 3 4 5 6 7 8
源字符串 a b c d h g f e
1 2 3 4 9 8 7 6 5
则处理后字符串 d c b a e f g h
4 3 2 1 9 5 6 7 8
部分源程序存在文件prog1.c中。
请勿改动主函数main()、读数据函数readdat()和输出数据函数writedat()的内容。
&emspinclude
&emspinclude
&emspinclude
char xx[20][80];
void jssort()
{int i,j,k,strl,half;
char ch;
for(i=0;ixx[i][k]) {ch=xx[i][j];xx[i][j]=xx[i][k];xx[i][k]=ch;}
}
}
void main()
{
readdat();
jssort();
writedat();
}
readdat()
{
file *in;
int i=0;
char *p;
in=fopen("in.dat","r");
while(i
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