C 汇编混合编程
As is Known to us,the function Main is the entry point of all programs.Therefore, we are usually neglecting all that we don't do,which makes us not understanding it more clearly.Now there is a sample arm program which will provide something that opration system usually do.
asm:
IMPORT main
area test,CODE,READONLY
ENTRY
bl start
start
bl main
C:
#define rGPBCON (*(volatile unsigned *)0x56000010) //Port B control
#define rGPBDAT (*(volatile unsigned *)0x56000014) //Port B data
#define rGPBUP (*(volatile unsigned *)0x56000018) //Pull-up control B
int main(int argc, char *argv[])
{
unsigned int temp = 0x0e;
rGPBCON = 0x00555555;
rGPBUP = 0xffff;
rGPBDAT = 0XE1F;
return 0;
}
The code very sample,but it is very useful.
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import sun.misc.Signal;
import sun.misc.SignalHandler;
/***
* java信号处理demo
* @author jiang_qh
*
*/
public class SignalHandlerExample implements SignalHandler{
private SignalHandler oldHandler;
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1 ＃i nclude “filename.h”和＃i nclude <filename.h>的区别?
答：对于＃i nclude <filename.h>编译器从标准库开始搜索filename.h
对于＃i nclude “filename.h”编译器从用户工作路径开始搜索filename.h
2 头文件的作用是什么?
答：一 ......
c学的人很多。但十之八九是半桶水。或者写得很死。也许我这话有点偏激。但是我给出一个标准吧。你能写出像linux内核代码这样的代码吗？其实任何一门语言的精髓，在于运用。所以在学习之前最好问一问我为什要学这门语言。如果是为学而学，学到最后又是半桶水。还真的不如看小说来得刺激。没有目的干事情，本身就是一种浪费。 ......
