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#include <stdio.h>
int main()
{
  char *p ="#include <stdio.h>%c int main(){char *p=%c%s%c; printf(p, 10, 34, p, 34);}";
  printf(p, 10, 34, p, 34);
} ......

Pipe is a worm hole connecting C and C++

In C programming language, the observer design pattern is implemented with function pointer (aka callback function). But in Qt library, it introduces signal and slot. How to link a callback function from the C callback function to the C++ siganl and slot is a problem I encounter. Call back function ......

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    constÓë#define×î´óµÄ²î±ð£¬ConstÔÚ¶ÑÕ»·ÖÅäÁ˿ռ䣬¶ø#defineÖ»ÊǰѾßÌåÊýÖµÖ±½Ó´«µÝµ½Ä¿±ê±äÁ¿°ÕÁË¡£»òÕß˵£¬constµÄ³£Á¿ÊÇÒ»¸öRun-TimeµÄ¸ÅÄËûÔÚ³ÌÐòÖÐȷȷʵʵµÄ´æÔÚ¿ÉÒÔ±»µ÷Óᢴ«µÝ¡£¶ø#define³£Á¿ÔòÊÇÒ»¸öCompile-Time¸ÅÄËüµÄÉúÃüÖÜÆÚÖ¹ÓÚ±àÒëÆÚ£ºÔÚʵ¼Ê³ÌÐòÖÐËûÖ»ÊÇÒ»¸ö³£Êý¡¢Ò»¸öÃüÁîÖе ......

ANSI C——printf

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#include<stdio.h>
int main ( int argc, char *argv[] )
{
printf("hello world!!\n");
return 0;
}
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