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you are right.Just do it.
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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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