学步园

 对一段字符串取反，里面每位都是16进，把每一位分别取反,然后输出。如：“1ffc0a”第一个1,取反是E,第2位是f，取反为0，...

       #include "stdafx.h"<br /> #include "stdio.h"<br /> #include "string.h"</p> <p>int main(int argc, char* argv[])<br /> {</p> <p> char str2[256];<br /> int len;<br /> char str[] = "FF03cF";</p> <p> char ch[] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};</p> <p> len=strlen(str);<br /> strupr(str);<br /> for (int i=0; i<len; i++)<br /> {<br /> if ('0'<=str[i] && str[i]<='9')<br /> str2[i] = ch[15-(str[i]-'0')];<br /> else if ('A'<=str[i] && str[i]<='F')<br /> str2[i] = ch[('F'-str[i])];<br /> else<br /> str2[i] = str[i];<br /> }</p> <p> str2[i] = 0;<br /> printf("%s",str2);<br /> }