C的TXT电子书阅读器（DOS）

可惜MS-DOS不是中国人写的，不支持中文。
/* Note:Your choice is C IDE */
#include "stdio.h"
main(int argc, char *argv[])
{
FILE *fp;
char ch;
int num=0,max;
int line=0;
if((fp=fopen(argv[1],"rt"))==NULL)
{
printf("\nCannot open file strike any key exit!");
getch();
exit(1);
}
while(ch!=EOF)
{
if(wherex()==1) {num++;printf("%d: ",num);}
putchar(ch);
ch=fgetc(fp);
}
max=num;
num=0;
fclose(fp);
while(1)
{
num=0;
fp=fopen(argv[1],"rt");
ch=fgetc(fp);
while(ch!=EOF)
{
if(wherex()==1) {num++;printf("%d: ",num);}
if(num==line+24) break;
putchar(ch);
ch=fgetc(fp);
}
printf("Which line do you want going to?(Most %d)",max);
scanf("%d",&line);
if(line<=0) exit(1);
}
}