main(){char *c="main(){char *c=%c%s%c;printf(c,34,c,34);}";printf(c,34,c,34);}

谁能解释一下最后一句printf(c,34,c,34)，谢谢。。

c is a format string.

try following code snippet:
===========================

/*---------------------------------------------------------------------------
File name: main.c
Author: HJin (email: fish_sea_bird [at] yahoo [dot] com )
Created on: 9/21/2007 02:56:54
Environment: WinXPSP2 En Pro + VS2005 v8.0.50727.762

Modification history:
===========================================================================

*/

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char** argv)
{
int c;
char ch;
FILE* fp = fopen(__FILE__, "r");

if(!fp)
{
printf("cannot open file.\n");
exit(1);
}

c=23*45;

while( (ch=fgetc(fp)) != EOF )
{
putchar(ch);
}

fclose(fp);

return 0;
}

简单的输出自身代码是获取main的地址，然后从此地址开始读取字节（全部是指令码）。。然后就O了，随便怎么处理。