Remenber Previous Input by test

#include<stdio.h>
int main()
{
    FILE *p;
    char s[9999];
    memset(s,0,9999);
    p=fopen("a.txt","r");
    if(p){
\x09fread(s,1,9999,p);
\x09puts(s);
\x09fclose(p);
    }
    memset(s,0,9999);
    fread(s,1,9999,stdin);
    p=fopen("a.txt","w");
    fputs(s,p);
    fclose(p);
    return 0;
}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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