上机复习资料.docx
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上机复习资料
全国计算机等级考试云南农业大学考点
全国计算机等级考试三级上机题
(分类注释)
一、替换字符。
.......................................................................2
1题....................................................................................2
3题....................................................................................2
9题....................................................................................3
27题..................................................................................4
30题..................................................................................4
73题..................................................................................5
二、字符串左右排序和比较...................................................5
2题....................................................................................5
4题....................................................................................6
6题....................................................................................7
12题..................................................................................8
26题..................................................................................8
71题..................................................................................9
84题..................................................................................9
98题................................................................................10
三、正整数排序求平均值(包括将数拆散、求最大最小值)
.................................................................................................10
8题..................................................................................10
31题................................................................................11
33题................................................................................11
46题................................................................................12
51题................................................................................13
58题................................................................................13
63题................................................................................14
69题................................................................................14
94题................................................................................15
四、产品五个因素的比较排列,是结构体操作问题..........15
11题................................................................................15
13题................................................................................16
17题................................................................................17
81题................................................................................18
85题................................................................................18
89题................................................................................19
五、素数.................................................................................20
14题................................................................................20
22题................................................................................20
51题................................................................................21
80题................................................................................21
六、数字排序.........................................................................22
10题................................................................................22
18题................................................................................22
七、其他数学计算.................................................................23
16题................................................................................23
20题................................................................................23
55题................................................................................23
59题................................................................................24
78题................................................................................24
88题................................................................................24
八、数字或字符移位后的计算.............................................25
21题................................................................................25
23题................................................................................25
41题................................................................................26
45题................................................................................27
77题................................................................................27
九、学生成绩,结构体问题.................................................28
24题................................................................................28
76题................................................................................28
十、字符串(单词)的倒置和删除.....................................29
25题................................................................................29
75题................................................................................29
十一、选票问题.....................................................................30
32题................................................................................30
68题................................................................................31
70题................................................................................31
82题................................................................................32
十二、出圈问题.....................................................................32
34题................................................................................32
十三、进制转换.....................................................................33
38题................................................................................33
40题................................................................................34
62题................................................................................34十四、其他.............................................................................35一题.................................................................................35二题.................................................................................35
33题................................................................................36
25题................................................................................36
本资料仅限于云南农业大学考点2010年上半年培训班学员使用
一、替换字符。
1题函数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*11mod256(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
#include
#include
#include
unsignedcharxx[50][80];
intmaxline=0;/*文章的总行数*/
intReadDat(void)voidWriteDat(void)voidencryptChar()
{
}
voidmain()
{clrscr();if(ReadDat()){
printf(\"数据文件ENG.IN不能打开!
\\n\\007\");
return;
}encryptChar();WriteDat();
}
intReadDat(void)
{
FILE*fp;
inti=0;
unsignedchar*p;if((fp=fopen(\"eng.in\",\"r\"))==NULL)return1;while(fgets(xx[i],80,fp)!
=NULL){p=strchr(xx[i],'\\n');
if(p)*p=0;
i++;
}maxline=i;fclose(fp);return0;
}
voidWriteDat(void)
{
FILE*fp;inti;fp=fopen(\"ps10.dat\",\"w\");for(i=0;i}
fclose(fp);
}
--------------------------------
注:
在ReadDat()函数中由于fgets()函数读入数据时没有读入字符串结束符'\0',因而用while()循环在xx数组每一行未尾将换行符'\n'替换成结束符'\0'。
编写的函数如下:
该函数的基本算法是——让字符指针pf指向每一行的开头然后逐一往后移动,在移动过程中按要求进行转换。
*pf=*pf/2*2用于判断是否为偶数。
if()条件语句用于控制不替代字符。
voidencryptChar()
{
inti;
char*pf;
for(i=0;i{pf=xx[i];
while(*pf!
=0)
{if(*pf==*pf/2*2||*pf*11%256<32)
{pf++;continue;}
*pf=*pf*11%256;
pf++;
}
}
}
voidencryptChar()
{
inti,j,t;
for(i=0;i{
for(j=0;j{
t=xx[i][j]*11%256;
if(t<=32||xx[i][j]%2==0)continue;
xx[i][j]=t;
}
}
}
3题函数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PS8.DAT中。
替代关系:
f(p)=p*11mod256(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),如果原字符是小写字母或计算后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
#include
#include
#include
unsignedcharxx[50][80];
intmaxline=0;/*文章的总行数*/
intReadDat(void)
voidWriteDat(void)
voidencryptChar()
{
}
voidmain()
{clrscr();if(ReadDat()){
printf(\"数据文件ENG.IN不能打开!
\\n\\007\");
return;
}encryptChar();WriteDat();
}
intReadDat(void)
{
FILE*fp;
inti=0;
unsignedchar*p;if((fp=fopen(\"eng.in\",\"r\"))==NULL)return1;while(fgets(xx[i],80,fp)!
=NULL){p=strchr(xx[i],'\\n');
if(p)*p=0;
i++;
}maxline=i;fclose(fp);return0;
}
voidWriteDat(void)
{
FILE*fp;inti;fp=fopen(\"ps8.dat\",\"w\");for(i=0;i}
fclose(fp);
}
--------------------------------
注:
与题1相似。
voidencryptchar()
{
inti;
char*pf;
for(i=0;i{pf=xx[i];
while(*pf!
=0)
{if(*pf>='a'&&*pf<='z'||*pf*11%256<32)
{pf++;continue;}
*pf=*pf*11%256;
pf++;
}
}
}
voidencryptChar()
{
inti,j,t;
for(i=0;ifor(j=0;j{
t=xx[i][j]*11%256;
if(t<=32||xx[i][j]>='a'&&
xx[i][j]<='z')
continue;