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unix 编程入门练习（1）

2011-03-04 23:57:56| 分类：编程 | 标签： |举报 |字号大中小订阅

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#include <stdio.h>

#define PAGELEN 24

#define LINELEN 512

void do_more(FILE *);

int see_more();

int main(int ac,char *av[])

{

FILE *fp;

if (ac==1）

do_more(stdin);

else

while(--ac)

if((fp=fopen(*++av,"r"))!=NULL)

{

do_more(fp);

fclose(fp);

}

else

exit(1);

return 0;

}

void do_more(FILE *fp)

{

char line[LINELEN];

int num_of_lines=0;

int see_more(),reply;

while(fgets(line,LINELEN,fp))

{

if(num_of_lines==PAGELEN)

{

reply=see_more();

if (reply==0)

break;

num_of_lines -=reply;

}

if (fputs(line,stdout)==EOF)

exit(1);

num_of_lines++;

}

int see_more()

{

int c;

while((c=getchar())!=EOF)

{

if (c=='q‘)

return 0;

if (c==' ')

return PAGELEN;

if (c=='\n')

return 1;

}

return 0;

}

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