2016最新计算机三级网络上机试题及答案
函数ReadDat( )实现从文件IN.DAT中读取一篇英文文章存入到字符串数组xx中; 请编制函数SortCharD( ), 其函数的`功能是: 以行为单位对字符按从大到小的顺序进行排序, 排序后的结果仍按行重新存入字符串数组xx中。最后main()函数调用函数WriteDat()把结果xx输出到文件OUT2.DAT中。
例: 原文: dAe,BfC.
CCbbAA
结果: fedCBA.,
bbCCAA
原始数据文件存放的格式是: 每行的宽度均小于80个字符, 含标点符号和空格。
注意: 部分源程序存放在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。
-----------------
PROG1.C
#include
#include
#include
char xx[50][80] ;
int maxline = 0 ; /* 文章的总行数 */
int ReadDat(void) ;
void WriteDat(void) ;
void SortCharD(void)
{int I,j,k,strl;
char ch;
for(I=0;I
{strl=strlen(xx[I]);
for(j=0;j
for(k=j+1;k
if(xx[I][j]
{ch=xx[I][j]; xx[I][j]=xx[I][k]; xx[I][k]=ch;}
}
}
void main()
{
clrscr() ;
if(ReadDat()) {
printf("数据文件IN.DAT不能打开!\n\007") ;
return ;
}
SortCharD() ;
WriteDat() ;
system("pause");
}
int ReadDat(void)
{
FILE *fp ;
int i = 0 ;
char *p ;
if((fp = fopen("IN.DAT", "r")) == NULL) return 1 ;
while(fgets(xx[i], 80, fp) != NULL) {
p = strchr(xx[i], '\n') ;
if(p) *p = 0 ;
i++ ;
}
maxline = i ;
fclose(fp) ;
return 0 ;
}
void WriteDat(void)
{
FILE *fp ;
int i ;
clrscr() ;
fp = fopen("OUT2.DAT", "w") ;
for(i = 0 ; i < maxline ; i++) {
printf("%s\n", xx[i]) ;
fprintf(fp, "%s\n", xx[i]) ;
}
fclose(fp) ;
}
IN.DAT
dAe,BfC.
CCbbAA
You can create an index on any field, on several fields to be used
together, or on parts thereof, that you want to use as a key. The
keys in indexes allow you quick access to specific records and define
orders for sequential processing of a ISAM file. After you no longer
need an index, you can delete it. Addition and indexes have no effect
on the data records or on other indexes.
You may want a field in field in each record to uniquely identify that
record from all other records in the file. For example, the Employee
Number field is unique if you do not assign the same number to two
different employees, and you never reassign these numbers to other
employees. If you wish to find or modify the record belonging to a
specific employee, this unique field saves the thouble of determining
whether you have the correct record.
If you do not have a unique field, you must find the first record
the matches your key and determine whether the record is the one you
want. If it is not the correct one, you must search again to find others.
If you know that you have a unique field within your records, you
can include this fact in the key description, and ISAM will allow only
unique keys. For example, if you specify that the employee numbers are
unique, ISAM only lets you add records to the file for, or change
numbers to, employee numbers that do not alreadly exist int file.
OUT.DAT
fedCBA.,
bbCCAA
yxvuuttsssrroooonnnnnnllliiiffeeeeeeeeeddddccbaaaaaY,
yywuuttttttttsssrrrrpoooooonnkhhhhgfeeeeeeeaaaaaT.,,
yyxwuutssssssrrqpoooonnnnllkkiiiiiiffeeeeeeeeddddccccccaaa
yuuttssssrrrrrrqpooooooonnnnllliiiggffffeeeeeeedcaaSMIAA.
yxxvuttttsooonnnnnnnnliiiiihffeeeeeeeeeeedddddddccaaaaA.,
xtttssrrrrooooonnnihheeeeedddcaa.
yyywuuutttttrrqooonnnnnmllliiiiiiihhfffeeeeeeddddccaaaaaY
yxtttsrrrrrrrppoooooonmmmllllliihhhffeeeeeeeeeeddccaaFE.,
ywuuuuuttttssssrrqooooonnnnmmmliiiiihgffeeeeeeddbbaaN
yyvuuttttsssssrrrrrpoooonnnnnmmliihhgffeeeeeeeeeeeeddbaa,
yyywutttssrrrpoooooooonnnmmlliiiihhggfffeeeeeedddcbaI.
yvuuuttttssssrqppooonnnmmllliiiiiiihhhgfffeeeeeeeeeeeddccba,
ywvutttrrrrrooohhhheeeeeedccca.
yyvuuuuuttttssrrrqooooonnnmliiiihhffffeeeeeddddcaaI,
yyywuuttttttssrrrrroooonnnmmkiihhhhhheeeeeeeeeeeedddccaa
ywuuttttttttssssrrrroooooonnnnnmiiiihhhgffeeeeedcccaaaaI..,
yyyywwvuuuuuutttsrrrqoooooonnnlkiiiihhhffeeeeddcaaaI,
yywwuttttssrpooonnnnnnllllllkiiiiiihhfeeeedddccccaaaaSMIA,
yyyyxuuuutttsssrrrqpppooonnmmmllkiiihhffeeeeeeeeeeecbaaaF.,
yyuuutttssrrrrqoooooonnnllliihhgffeeeeeedddccaaSMIA,,
yyxuuttttttsssrrrpoooonnnnmmmlllliiihfeeeeeeeeddbbaaa.
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