lqb 基础练习 十六进制转八进制 (字符串进行进制转化)

 1 #include <iostream>
 2 #include <algorithm>
 3 #include <cstring>
 4 #include <cstdio>
 5 #include <cmath>
 6 #include <stack>
 7 #include <map>
 8 #include <queue>
 9 
10 using namespace std;
11 
12 int main()
13 {
14     int n;
15     scanf("%d", &n);
16     while(n --)
17     {
18         string str1, str2;
19         cin >>str1;
20         int len = str1.size();
21         for (int i=0; i<len; ++i) {
22             if (str1[i] == ‘0‘) str2 += "0000";
23             else if (str1[i] == ‘1‘) str2 += "0001";
24             else if (str1[i] == ‘2‘) str2 += "0010";
25             else if (str1[i] == ‘3‘) str2 += "0011";
26             else if (str1[i] == ‘4‘) str2 += "0100";
27             else if (str1[i] == ‘5‘) str2 += "0101";
28             else if (str1[i] == ‘6‘) str2 += "0110";
29             else if (str1[i] == ‘7‘) str2 += "0111";
30             else if (str1[i] == ‘8‘) str2 += "1000";
31             else if (str1[i] == ‘9‘) str2 += "1001";
32             else if (str1[i] == ‘A‘) str2 += "1010";
33             else if (str1[i] == ‘B‘) str2 += "1011";
34             else if (str1[i] == ‘C‘) str2 += "1100";
35             else if (str1[i] == ‘D‘) str2 += "1101";
36             else if (str1[i] == ‘E‘) str2 += "1110";
37             else if (str1[i] == ‘F‘) str2 += "1111";
38         }
39 
40         int len_ = str2.size();
41         if (len_ % 3 == 1) str2 = "00" + str2;
42         if (len_ % 3 == 2) str2 = "0" +str2;
43 
44         int len_now = str2.size(), flag = 0, temp;
45         for (int i = 0; i < len_now; i += 3)
46         {
47             temp = int(str2[i] - ‘0‘) * 4 + int(str2[i + 1] - ‘0‘) * 2
48                    + int(str2[i + 2] - ‘0‘);
49             if (temp) flag = 1;
50             if (flag) printf("%d", temp);
51         }
52         printf("\n");
53     }
54     return 0;
55 }