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you are right.Just do it.

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¼Ù¶¨Ò»Ðв»³¬¹ý1000×Ö·û£¬
ɾȥµÚ3ÐУ¬L=3.  
ÊäÈëÊä³öÎļþÃû a.txt


C/C++ code:
#include<stdio.h>

void main()
{
FILE *fin;
fpos_t pos_w,pos_r,pos;
int i,k,L=3;
char *one_line;

one_line = (char *) malloc(1000*sizeof(char));

fin = fopen ("a.txt","rb+");
for (i=1;i<L;i++) fgets(one_line,999,fin);

fgetpos (fin,&pos_w);
fgets(one_line,999,fin); // delete
fgetpos (fin,&pos_r);
pos = pos_r;

while (1 == 1)
{
fsetpos (fin,&pos);
if (fgets(one_line,999,fin) ==NULL) break;
fgetpos (fin,&pos_r);
pos = pos_w;
fsetpos (fin,&pos);
fprintf(fin,"%s",o


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