-
Notifications
You must be signed in to change notification settings - Fork 0
/
numsys.cpp
143 lines (127 loc) · 3.15 KB
/
numsys.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
#include <cmath>
#include <string>
#include <iostream>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <algorithm>
#include "Stack.h"
#ifndef EPS
#define EPS 0.000001
#endif
using namespace std;
static char digit[] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
static char num_dig[] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
int dot = 0;
float decimal = 0;
int integer = 0;
string upper(string str){
transform(str.begin(), str.end(), str.begin(), ::toupper);
return str;
}
float convert_to_10(string num,int R1){
float ans = 0;
dot = 0;
decimal = 0;
integer = 0;
bool isPos = true;
bool isDes = false;
int num_size = num.size();
num = upper(num);
char *old_pha = (char *)num.c_str();
char *pha = old_pha;
if(*pha == '-') {
isPos = false;
num_size--;
pha++;
}
char *p = pha;
for (p = pha + num_size - 1; p != pha - 1; --p){
if(*p == '.') {
dot = pha + num_size - 1 - p;
isDes = true;
}
}
int i = num_size - 1 - dot;
if(isDes) i--;
for (p = pha;*p != '.' && *p != '\0'; ++p)
{
for (int j = 0; j < 16; ++j)
{
if(*p == digit[j])
integer += num_dig[j] * pow(R1 ,i);
}
i--;
}
if(isDes) p++;
i = -1;
for (;*p != '\0'; ++p)
{
for (int j = 0; j < 16; ++j)
{
if(*p == digit[j])
decimal += ((float)num_dig[j] )* pow(R1 ,i);
}
i--;
}
ans = integer + decimal;
if(!isPos) ans = -ans;
return ans;
}
string convert(string num,int R1,int R2)
{
float flo_num;
Stack <char> answer;
flo_num = convert_to_10(num,R1);
cout << "Notes:" << flo_num << "(10)" << endl;
while(integer != 0){
answer.push(digit[integer % R2]);
integer = integer / R2;
}
string str;
for (int i = 0;!answer.empty(); ++i)
{
str.push_back(answer.pop());
}
if(dot > 0){
str.push_back('.');
while(decimal != 0){
decimal = decimal * R2;
str.push_back(digit[(int)decimal]);
decimal -= (int)decimal;
}
}
return str;
}
void Numsys()
{
int r1,r2;
string former;
string later;
do
{
cout << ">>>Input number and R1:" ;
cin >> former;
if(former == "q") break;
cin >> r1;
if (r1 == 0) {
cout << "Error:R1 shouldn't be 0." << endl;
continue;
}
cout << "To R2:";
cin >> r2;
if (r2 == 0) {
cout << "Error:R2 shouldn't be 0." << endl;
continue;
}
else if(r2 == 10){
cout << "The answer is:" << convert_to_10(former,r1) << "(" << r2 << ")" << endl;
}
else {
later = convert(former,r1,r2);
cout << "The answer is:" << later << "(" << r2 << ")" << endl;
}
cout << "q to quit." << endl;
}while (former != "q");
}