Decimal to arbitrary base

Time:2021-9-29

Dear friends

In the afternoon, I recorded the decimal conversion to other arbitrary decimal algorithms. The complete code is implemented as follows. The basic principle uses the rolling division method.

1 #include
  2 #include
  3 #include
  4 #include
  5 #include
  6 #include 
  7 using namespace std;
  8 
  9 string JinZhi10To2Str(int n)
 10 {
 11     int i;
 12     string temp = "";
 13     string value = "";
 14     i = n;
 15     while (i) {
 16         //_itoa_s(i % 2,str,10);
 17         temp = to_string(i % 2);
 18         value = temp + value; // Flashback splicing
 19         i /= 2;
 20     }
 21     return value;
 22 }
 23 
 24 string JinZhi10To8Str(int n)
 25 {
 26     int i;
 27     string value = "";
 28     string temp = "";
 29     i = n;
 30     while (i)
 31     {
 32         temp = to_string(i % 8);
 33         value = temp + value;
 34         i /= 8;
 35     }
 36     return value;
 37 }
 38 
 39 string JinZhi10To16Str(int n)
 40 {
 41     int i;
 42     string value = "";
 43     string temp = "";
 44     i = n;
 45     while (i) {
 46         int m = i % 16;
 47         if (m >= 10) {
 48             switch (m)
 49             {
 50             case 10:temp = "A"; break;
 51             case 11:temp = "B"; break;
 52             case 12:temp = "C"; break;
 53             case 13:temp = "D"; break;
 54             case 14:temp = "E"; break;
 55             case 15:temp = "F"; break;
 56             default:
 57                 break;
 58             }
 59             value = temp + value;
 60         }
 61         else {
 62             temp = to_string(m);
 63             value = temp + value;
 64         }
 65         i /= 16;
 66     }
 67     return value;
 68 }
 69 
 70 string JinZhi10To32Str(int n)
 71 {
 72     string value;
 73     string tmp;
 74     
 75     char str[100];
 76     for (int i = 3; i >= 0; i--)
 77     {
 78         int a = 1;
 79         switch (i)
 80         {
 81         case 1: a = 32; break;
 82         case 2: a = 32 * 32; break;
 83         case 3: a = 32 * 32 * 32; break;
 84         }
 85 
 86         tmp = "";
 87         int b = n / a;
 88         if (b <= 0x0f)
 89         {
 90 
 91             _itoa_s(b, str, 16);
 92             string s(&str[0], &str[strlen(str)]);
 93             transform(s.begin(), s.end(), s.begin(), ::toupper);// Convert to uppercase
 94             //transform(str.begin(), str.end(), str.begin(), ::tolower); // Convert to lowercase
 95             tmp = s;
 96 
 97             //tmp = to_ string(b);// You can directly convert an integer to a string type and include it in #include
 98 
 99         #if 0
100             tmp.format("%x", b); // Format hexadecimal output in MFC
101         #endif
102 
103         }
104         else
105         {
106             // g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v
107             switch (b)
108             {
109             case 16:tmp = "G"; break;
110             case 17:tmp = "H"; break;
111             case 18:tmp = "J"; break;
112             case 19:tmp = "K"; break;
113             case 20:tmp = "L"; break;
114             case 21:tmp = "M"; break;
115             case 22:tmp = "N"; break;
116             case 23:tmp = "P"; break;
117             case 24:tmp = "R"; break;
118             case 25:tmp = "S"; break;
119             case 26:tmp = "T"; break;
120             case 27:tmp = "V"; break;
121             case 28:tmp = "W"; break;
122             case 29:tmp = "X"; break;
123             case 30:tmp = "Y"; break;
124             case 31:tmp = "Z"; break;
125             default:tmp = ""; break;
126             }
127         }
128         value += tmp;
129         n %= a;
130     }
131     return value;
132 }
133 
134 string JinZhi10To32Str_1(int n)
135 {
136     int i;
137     string value = "";
138     string temp = "";
139     i = n;
140     while (i) {
141         int m = i % 32;
142         if (m >= 10) {
143             switch (m)
144             {
145             case 10:temp = "A"; break;
146             case 11:temp = "B"; break;
147             case 12:temp = "C"; break;
148             case 13:temp = "D"; break;
149             case 14:temp = "E"; break;
150             case 15:temp = "F"; break;
151             case 16:temp = "G"; break;
152             case 17:temp = "H"; break;
153             case 18:temp = "I"; break;
154             case 19:temp = "J"; break;
155             case 20:temp = "K"; break;
156             case 21:temp = "L"; break;
157             case 22:temp = "M"; break;
158             case 23:temp = "N"; break;
159             case 24:temp = "O"; break;
160             case 25:temp = "P"; break;
161             case 26:temp = "Q"; break;
162             case 27:temp = "R"; break;
163             case 28:temp = "S"; break;
164             case 29:temp = "T"; break;
165             case 30:temp = "U"; break;
166             case 31:temp = "V"; break;
167             default:
168                 break;
169             }
170             value = temp + value;
171         }
172         else {
173             temp = to_string(m);
174             value = temp + value;
175         }
176         i /= 32;
177     }
178     return value;
179 }
180 
181 int main() 
182 {
183     int m,temp;
184     while (true) {
185 cout < < endl < < "* * * * * * * * * * * *" < < endl;
186         cout << "  *                                      *" << endl;
187 cout < < "* hex 1, hex 10 to hex 2 *" < < endl;
188         cout << "  *                                      *" << endl;
189 cout < < "* 2, 10 to 8 *" < < endl;
190         cout << "  *                                      *" << endl;
191 cout < < "* 3, hexadecimal to hexadecimal *" < < endl;
192         cout << "  *                                      *" << endl;
193 cout < < "* 4, 10 base to 32 base (except I, O, u, V) *" < < endl;
194         cout << "  *                                      *" << endl;
195 cout < < 5, 10 to 32 * "< < endl;
196         cout << "  *                                      *" << endl;
197         cout << "  * * * * * * * * * * * * * * * * * * * **" << endl << endl;
198 cout < < "please select:";
199         cin >> m;
200         switch (m)
201         {
202         case 1:
203 cout < < "decimal number:";
204             cin >> temp;
205 cout < < temp < < convert to binary: < < jinzhi10to2str (Temp) < < endl < < endl;
206             break;
207         case 2:
208 cout < < "decimal number:";
209             cin >> temp;
210 cout < < temp < < convert to octal: < < jinzhi10to8str (Temp) < < endl < < endl;
211             break;
212         case 3:
213 cout < < "decimal number:";
214             cin >> temp;
215 cout < < temp < < convert to hexadecimal: < < jinzhi10to16str (Temp) < < endl < < endl;
216             break;
217         case 4:
218 cout < < "decimal number:";
219             cin >> temp;
220 cout < < temp < < convert to 32 base system: < < jinzhi10to32str (Temp) < < endl < < endl;
221             break;
222         case 5:
223 cout < < "decimal number:";
224             cin >> temp;
225 cout < < temp < < convert to 32 base system: < < jinzhi10to32str_ 1(temp) << endl << endl;
226             break;
227         default:
228 cout < < can only be selected from 1-6 < < endl;
229             break;
230         }
231     }
232 }
233 
234 
235 #if 0
236 
237 #include 
238 #include 
239 int main()
240 {
241     int num = 32;
242     char str[100];
243     _ itoa_ s(num, str, 32);  // Commonly used in C + +_ Itoa, you can use Itoa,
244     printf("%s\n", str);
245     return 0;
246 }
247 
248 
249 #include
250 using namespace std;
251 void main()
252 {
253     int n, i, j = 0;
254     int a[1000];
255     cin >> n;
256     i = n;
257     while (i)
258     {
259         a[j] = i % 2;
260         i /= 2;
261         j++;
262 
263     }
264     for (i = j - 1; i >= 0; i--)
265         cout << a[i];
266     cout << endl;
267 }
268 #endif

Operation screenshot: