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南开计算机等级考试上机100题(三级)

南开计算机等级考试上机100题（三级）

1. 函数ReadDat()实现从文件ENG.IN中读取一篇英文文章，存入到字符串数组xx中；请编制函数encryptChar()，按给定的替代关系对数组xx中的所有字符进行替代，仍存入数组xx的对应的位置上，最后调用函数WriteDat()把结果xx输出到文件PS10.DAT中。

替代关系：f(p)=p*11 mod 256 (p是数组中某一个字符的ASCII值，f(p)是计算后新字符的ASCII值)，如果原字符的ASCII值是偶数或计算后f(p)值小于等于32，则该字符不变，否则将f(p)所对应的字符进行替代。部分源程序已给出，原始数据文件存放的格式是：每行的宽度均小于80个字符。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。

#include

unsigned char xx[50][80];

int maxline=0;/*文章的总行数*/

int ReadDat(void)

void WriteDat(void)

void encryptChar()

{ int i,j;

char *p;

for(i=0;i='a'&&xx[j]='0'&&p='A'&&p='0'&&xx[j]='A'&&xx[j] ='a'&&p130)

;

else xx[j]=p; } }

11.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(第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，最后调用函数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值升序排序，排序后左边部分与右边部分进行交换。如果原字符串长度为奇数，则最中间的字符不参加处理，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d c b a h g f e

4 3 2 1 9 8 7 6 5

则处理后字符串h g f e a b c d

8 7 6 5 9 1 2 3 4

部分源程序已给出。请勿改动主函数main()、读函数ReadDat()和写函数WriteDat()的内容。

#include

char xx[20][80];

void jsSort()

{ int i,j,k,m;

char c;

for(i=0;ixx[m])

{ c=xx[j];

xx[j]=xx[m];

xx[m]=c; }

for(j=0;jxx[m])

{ c=xx[j];

xx[j]=xx[m];

xx[m]=c; } }

}

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