c语言 int与byte[]互相转换

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gdb调试

root@ubuntu:/media/mtk6795/alps/sunwave_pub# gcc -g test.c root@ubuntu:/media/mtk6795/alps/sunwave_pub# gdb ./a.out GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04Copyright (C) 2012 Free Software Foundation, Inc.License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>This is free software: you are free to change and redistribute it.There is NO WARRANTY, to the extent permitted by law.  Type "show copying"and "show warranty" for details.This GDB was configured as "x86_64-linux-gnu".For bug reporting instructions, please see:<http://bugs.launchpad.net/gdb-linaro/>...Reading symbols from /media/mtk6795/alps/sunwave_pub/a.out...done.(gdb) startTemporary breakpoint 1 at 0x40054c: file test.c, line 6.Starting program: /media/mtk6795/alps/sunwave_pub/a.out Temporary breakpoint 1, main () at test.c:66int a =257; (gdb) n7int a0=0,a1=0;(gdb) 8unsigned char * pBuf = NULL ;(gdb) 9int b=0;(gdb) 10pBuf = (unsigned char*) malloc(72*128*sizeof(unsigned char));(gdb) 13    pBuf[0] =(unsigned char)(a & 0xff);(gdb) 14pBuf[1] = (unsigned char)((a & 0xff00) >> 8);(gdb) 16    a0 = a%256;(gdb) 17    a1 = a/256;(gdb) 19printf("bruce int2byte  ==>> pBuf[0]=%d,pBuf[1]=%d\n",pBuf[0],pBuf[1]);(gdb) bruce int2byte  ==>> pBuf[0]=1,pBuf[1]=120printf("bruce int2byte  ==>> a0=%d,a1=%d\n",a0,a1);(gdb) bruce int2byte  ==>> a0=1,a1=123b =(int)(( pBuf[0] & 0xff )|((pBuf[1] & 0xff)<<8));(gdb) 24printf("bruce byte2int  ==>> b=%d\n",b);(gdb) bruce byte2int  ==>> b=25727return 0;(gdb) 28}(gdb)

c语言 int与byte[]互相转换

#include<stdio.h>#include<string.h>#include<math.h> #include<stdlib.h>int main(){int a =257; int a0=0,a1=0;unsigned char * pBuf = NULL ;int b=0;pBuf = (unsigned char*) malloc(72*128*sizeof(unsigned char));//int2byte    pBuf[0] =(unsigned char)(a & 0xff);pBuf[1] = (unsigned char)((a & 0xff00) >> 8);    a0 = a%256;    a1 = a/256;printf("bruce int2byte  ==>> pBuf[0]=%d,pBuf[1]=%d\n",pBuf[0],pBuf[1]);printf("bruce int2byte  ==>> a0=%d,a1=%d\n",a0,a1);    //byte2intb =(int)(( pBuf[0] & 0xff )|((pBuf[1] & 0xff)<<8));printf("bruce byte2int  ==>> b=%d\n",b);return 0;}

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