0

someone showed me their code for their conversion program

and left before I could ask question about how his program works

q1:how exactly does "*" this work when not applied for mutipling?

q2:does "a_base" and "b_base" work with this function unsigned long base2dec(char str[],int base) and does it have to do it the "_"?

q3:what is the purpose of the [MAX_BIT]?

q4:what is he trying to do in line 41. to 52.

q5:how do I highlight code on daniweb? ... tried to do it but the preview looked a bit off

```
1. #include<iostream>
2. #include<cmath>
3. using namespace std;
4. const char digits[16]= {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
5. const int MAX_BIT =32;
6. int digit2value(char);
7. char value2digit(int);
8.
9. unsigned long base2dec(char[],int);
10. char * dec2base(unsigned long, int);
11.
12. void main(){
13.
14. char a_num[MAX_BIT],*b_num;
15.
16. int a_base,b_base;
17.
18. unsigned long dec_num;
19.
20. cout<<"enter radix a: ";
21. cin>>a_base;
22.
23. cout<<"enter numbers to convert from radix a: ";
24. cin>>a_num;
25.
26. cout<<"enter radix b: ";
27. cin>>b_base;
28.
29. dec_num = base2dec(a_num,a_base);
30.
31. b_num = dec2base(dec_num,b_base);
32.
33. cout<<"converted #s: ";
34.
35. for(int i= strlen(b_num)-1;i>=0;i--)
36. cout<<b_num[i];
37.
38. cout<<endl;
39.
40. }
41. char value2digit(int value){
42.
43. return digits[value];
44. }
45 . int digit2value(char digit){
46.
47. for(int i=0;i<strlen(digits);i++)
48.
49. if(digit==digits[i])
50.
51. return i;
52. }
53.
54 . unsigned long base2dec(char str[],int base){
55.
56. int ans =0;
57.
58. for(int i=strlen(str)-1;i<strlen(str);i--)
59.
60. ans+=digit2value(str[i])*pow((double)base,(double) strlen(str) -i-1);
61. return ans;
62. }
63.
64. char*dec2base(unsigned long dec, int base){
65. char * ans = new char[MAX_BIT];
66. int i=0;
67.
68. while(dec>0){
69. ans[i]=value2digit(dec%base);
70. dec= dec/base;
71.
72. i++;
73. }
74. ans[i] =0;
75. return ans;
76. }
```