颜色反转
题目链接： http://exercise.acmcoder.com/online/online_judge_ques?ques_id=3340&konwledgeId=40
解题思路： 直接模拟。
1 #include <bits/stdc++.h> 2 using namespace std; 3 4 int getOrder(char ch) 5 { 6 if (isdigit(ch)) return ch-'0'; 7 return ch-'A'+10; 8 } 9 10 char getChar(int x) 11 { 12 if (x<10) return '0' + x; 13 return 'A' + x - 10; 14 } 15 16 int char2int(char *s) 17 { 18 return getOrder(s[0])*16 + getOrder(s[1]); 19 } 20 21 void int2char(int x, char *s) 22 { 23 int i = x / 16; 24 int j = x % 16; 25 s[0] = getChar(i); 26 s[1] = getChar(j); 27 } 28 29 int main() 30 { 31 char s[10]; 32 while (scanf("%s", s) != -1) 33 { 34 int x = char2int(s+1); 35 int2char(255-x,s+1); 36 x=char2int(s+3); 37 int2char(255-x,s+3); 38 x=char2int(s+5); 39 int2char(255-x,s+5); 40 printf("%s\n",s); 41 } 42 return 0; 43 }
