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全国计算机等级考试二级C语言上机题11

10月30日 编辑 39baobao.com

[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11 程序prog1.c的功能是:把 s 字符串中的所有字母改写成该字母的下一个字母,字母z改写成字母a。要求大写字母仍为大写字母,小写字母仍为小写字母,其它字符不做改变。

 请考生编写函数chg(char *s)实现程序要求,后调用函数readwritedat( )把结果输出到文件bc1.out中。

 例如:s 字符串中原有的内容为:mn.123zxy,则调用该函数后,结果为:no.123ayz。

 注意:部分源程序存在文件prog1.c文件中。

 请勿改动主函数main( )和输出数据函数readwritedat()的内容。

&emspinclude

&emspinclude

&emspinclude

&emspinclude

&emspdefine n 81

void readwritedat();



void chg(char *s)

{int i;

for(i=0;i if(s[i]=='z'

s[i]=='z') s[i]-=25;

 else if(s[i]>='a'

 }



main( )

{

 char a[n];

 clrscr();

 printf("enter a string : "); gets(a);

 printf("the original string is : "); puts(a);

 chg(a);

 printf("the string after modified : ");

 puts (a);

 readwritedat() ;

}



void readwritedat()

{

 int i ;

 char a[n] ;

 file *rf, *wf ;



 rf = fopen("bc1.in", "r") ;

 wf = fopen("bc1.out", "w") ;

 for(i = 0 ; i< 50 ; i++) {

 fscanf(rf, "%s", a) ;

 chg(a) ;

 fprintf(wf, "%s\n", a) ;

 }

 fclose(rf) ;

 fclose(wf) ;

}

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