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‎Conversions/AnyBaseToAnyBase.java

+102-110
Original file line numberDiff line numberDiff line change
@@ -6,130 +6,122 @@
66
import java.util.Scanner;
77

88
/**
9-
* Class for converting from "any" base to "any" other base, when "any" means from 2-36.
10-
* Works by going from base 1 to decimal to base 2. Includes auxiliary method for
11-
* determining whether a number is valid for a given base.
9+
* Class for converting from "any" base to "any" other base, when "any" means from 2-36. Works by
10+
* going from base 1 to decimal to base 2. Includes auxiliary method for determining whether a
11+
* number is valid for a given base.
1212
*
1313
* @author Michael Rolland
1414
* @version 2017.10.10
1515
*/
1616
public class AnyBaseToAnyBase {
1717

18-
/**
19-
* Smallest and largest base you want to accept as valid input
20-
*/
21-
static final int MINIMUM_BASE = 2;
22-
static final int MAXIMUM_BASE = 36;
18+
/** Smallest and largest base you want to accept as valid input */
19+
static final int MINIMUM_BASE = 2;
2320

24-
public static void main(String[] args) {
25-
Scanner in = new Scanner(System.in);
26-
String n;
27-
int b1, b2;
28-
while (true) {
29-
try {
30-
System.out.print("Enter number: ");
31-
n = in.next();
32-
System.out.print("Enter beginning base (between " + MINIMUM_BASE + " and " + MAXIMUM_BASE + "): ");
33-
b1 = in.nextInt();
34-
if (b1 > MAXIMUM_BASE || b1 < MINIMUM_BASE) {
35-
System.out.println("Invalid base!");
36-
continue;
37-
}
38-
if (!validForBase(n, b1)) {
39-
System.out.println("The number is invalid for this base!");
40-
continue;
41-
}
42-
System.out.print("Enter end base (between " + MINIMUM_BASE + " and " + MAXIMUM_BASE + "): ");
43-
b2 = in.nextInt();
44-
if (b2 > MAXIMUM_BASE || b2 < MINIMUM_BASE) {
45-
System.out.println("Invalid base!");
46-
continue;
47-
}
48-
break;
49-
} catch (InputMismatchException e) {
50-
System.out.println("Invalid input.");
51-
in.next();
52-
}
21+
static final int MAXIMUM_BASE = 36;
22+
23+
public static void main(String[] args) {
24+
Scanner in = new Scanner(System.in);
25+
String n;
26+
int b1, b2;
27+
while (true) {
28+
try {
29+
System.out.print("Enter number: ");
30+
n = in.next();
31+
System.out.print(
32+
"Enter beginning base (between " + MINIMUM_BASE + " and " + MAXIMUM_BASE + "): ");
33+
b1 = in.nextInt();
34+
if (b1 > MAXIMUM_BASE || b1 < MINIMUM_BASE) {
35+
System.out.println("Invalid base!");
36+
continue;
37+
}
38+
if (!validForBase(n, b1)) {
39+
System.out.println("The number is invalid for this base!");
40+
continue;
5341
}
54-
System.out.println(base2base(n, b1, b2));
55-
in.close();
42+
System.out.print(
43+
"Enter end base (between " + MINIMUM_BASE + " and " + MAXIMUM_BASE + "): ");
44+
b2 = in.nextInt();
45+
if (b2 > MAXIMUM_BASE || b2 < MINIMUM_BASE) {
46+
System.out.println("Invalid base!");
47+
continue;
48+
}
49+
break;
50+
} catch (InputMismatchException e) {
51+
System.out.println("Invalid input.");
52+
in.next();
53+
}
5654
}
55+
System.out.println(base2base(n, b1, b2));
56+
in.close();
57+
}
5758

58-
/**
59-
* Checks if a number (as a String) is valid for a given base.
60-
*/
61-
public static boolean validForBase(String n, int base) {
62-
char[] validDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E',
63-
'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
64-
'W', 'X', 'Y', 'Z'};
65-
// digitsForBase contains all the valid digits for the base given
66-
char[] digitsForBase = Arrays.copyOfRange(validDigits, 0, base);
59+
/** Checks if a number (as a String) is valid for a given base. */
60+
public static boolean validForBase(String n, int base) {
61+
char[] validDigits = {
62+
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',
63+
'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
64+
};
65+
// digitsForBase contains all the valid digits for the base given
66+
char[] digitsForBase = Arrays.copyOfRange(validDigits, 0, base);
6767

68-
// Convert character array into set for convenience of contains() method
69-
HashSet<Character> digitsList = new HashSet<>();
70-
for (int i = 0; i < digitsForBase.length; i++)
71-
digitsList.add(digitsForBase[i]);
68+
// Convert character array into set for convenience of contains() method
69+
HashSet<Character> digitsList = new HashSet<>();
70+
for (int i = 0; i < digitsForBase.length; i++) digitsList.add(digitsForBase[i]);
7271

73-
// Check that every digit in n is within the list of valid digits for that base.
74-
for (char c : n.toCharArray())
75-
if (!digitsList.contains(c))
76-
return false;
72+
// Check that every digit in n is within the list of valid digits for that base.
73+
for (char c : n.toCharArray()) if (!digitsList.contains(c)) return false;
7774

78-
return true;
79-
}
75+
return true;
76+
}
8077

81-
/**
82-
* Method to convert any integer from base b1 to base b2. Works by converting from b1 to decimal,
83-
* then decimal to b2.
84-
*
85-
* @param n The integer to be converted.
86-
* @param b1 Beginning base.
87-
* @param b2 End base.
88-
* @return n in base b2.
89-
*/
90-
public static String base2base(String n, int b1, int b2) {
91-
// Declare variables: decimal value of n,
92-
// character of base b1, character of base b2,
93-
// and the string that will be returned.
94-
int decimalValue = 0, charB2;
95-
char charB1;
96-
String output = "";
97-
// Go through every character of n
98-
for (int i = 0; i < n.length(); i++) {
99-
// store the character in charB1
100-
charB1 = n.charAt(i);
101-
// if it is a non-number, convert it to a decimal value >9 and store it in charB2
102-
if (charB1 >= 'A' && charB1 <= 'Z')
103-
charB2 = 10 + (charB1 - 'A');
104-
// Else, store the integer value in charB2
105-
else
106-
charB2 = charB1 - '0';
107-
// Convert the digit to decimal and add it to the
108-
// decimalValue of n
109-
decimalValue = decimalValue * b1 + charB2;
110-
}
78+
/**
79+
* Method to convert any integer from base b1 to base b2. Works by converting from b1 to decimal,
80+
* then decimal to b2.
81+
*
82+
* @param n The integer to be converted.
83+
* @param b1 Beginning base.
84+
* @param b2 End base.
85+
* @return n in base b2.
86+
*/
87+
public static String base2base(String n, int b1, int b2) {
88+
// Declare variables: decimal value of n,
89+
// character of base b1, character of base b2,
90+
// and the string that will be returned.
91+
int decimalValue = 0, charB2;
92+
char charB1;
93+
String output = "";
94+
// Go through every character of n
95+
for (int i = 0; i < n.length(); i++) {
96+
// store the character in charB1
97+
charB1 = n.charAt(i);
98+
// if it is a non-number, convert it to a decimal value >9 and store it in charB2
99+
if (charB1 >= 'A' && charB1 <= 'Z') charB2 = 10 + (charB1 - 'A');
100+
// Else, store the integer value in charB2
101+
else charB2 = charB1 - '0';
102+
// Convert the digit to decimal and add it to the
103+
// decimalValue of n
104+
decimalValue = decimalValue * b1 + charB2;
105+
}
111106

112-
// Converting the decimal value to base b2:
113-
// A number is converted from decimal to another base
114-
// by continuously dividing by the base and recording
115-
// the remainder until the quotient is zero. The number in the
116-
// new base is the remainders, with the last remainder
117-
// being the left-most digit.
118-
if (0 == decimalValue)
119-
return "0";
120-
// While the quotient is NOT zero:
121-
while (decimalValue != 0) {
122-
// If the remainder is a digit < 10, simply add it to
123-
// the left side of the new number.
124-
if (decimalValue % b2 < 10)
125-
output = Integer.toString(decimalValue % b2) + output;
126-
// If the remainder is >= 10, add a character with the
127-
// corresponding value to the new number. (A = 10, B = 11, C = 12, ...)
128-
else
129-
output = (char) ((decimalValue % b2) + 55) + output;
130-
// Divide by the new base again
131-
decimalValue /= b2;
132-
}
133-
return output;
107+
// Converting the decimal value to base b2:
108+
// A number is converted from decimal to another base
109+
// by continuously dividing by the base and recording
110+
// the remainder until the quotient is zero. The number in the
111+
// new base is the remainders, with the last remainder
112+
// being the left-most digit.
113+
if (0 == decimalValue) return "0";
114+
// While the quotient is NOT zero:
115+
while (decimalValue != 0) {
116+
// If the remainder is a digit < 10, simply add it to
117+
// the left side of the new number.
118+
if (decimalValue % b2 < 10) output = Integer.toString(decimalValue % b2) + output;
119+
// If the remainder is >= 10, add a character with the
120+
// corresponding value to the new number. (A = 10, B = 11, C = 12, ...)
121+
else output = (char) ((decimalValue % b2) + 55) + output;
122+
// Divide by the new base again
123+
decimalValue /= b2;
134124
}
125+
return output;
126+
}
135127
}

‎Conversions/AnyBaseToDecimal.java

+40-42
Original file line numberDiff line numberDiff line change
@@ -1,53 +1,51 @@
11
package Conversions;
22

3-
/**
4-
* @author Varun Upadhyay (https://github.com/varunu28)
5-
*/
3+
/** @author Varun Upadhyay (https://github.com/varunu28) */
64

75
// Driver program
86
public class AnyBaseToDecimal {
9-
public static void main(String[] args) {
10-
assert convertToDecimal("1010", 2) == Integer.valueOf("1010", 2);
11-
assert convertToDecimal("777", 8) == Integer.valueOf("777", 8);
12-
assert convertToDecimal("999", 10) == Integer.valueOf("999", 10);
13-
assert convertToDecimal("ABCDEF", 16) == Integer.valueOf("ABCDEF", 16);
14-
assert convertToDecimal("XYZ", 36) == Integer.valueOf("XYZ", 36);
15-
}
7+
public static void main(String[] args) {
8+
assert convertToDecimal("1010", 2) == Integer.valueOf("1010", 2);
9+
assert convertToDecimal("777", 8) == Integer.valueOf("777", 8);
10+
assert convertToDecimal("999", 10) == Integer.valueOf("999", 10);
11+
assert convertToDecimal("ABCDEF", 16) == Integer.valueOf("ABCDEF", 16);
12+
assert convertToDecimal("XYZ", 36) == Integer.valueOf("XYZ", 36);
13+
}
1614

17-
/**
18-
* Convert any radix to decimal number
19-
*
20-
* @param s the string to be convert
21-
* @param radix the radix
22-
* @return decimal of bits
23-
* @throws NumberFormatException if {@code bits} or {@code radix} is invalid
24-
*/
25-
public static int convertToDecimal(String s, int radix) {
26-
int num = 0;
27-
int pow = 1;
15+
/**
16+
* Convert any radix to decimal number
17+
*
18+
* @param s the string to be convert
19+
* @param radix the radix
20+
* @return decimal of bits
21+
* @throws NumberFormatException if {@code bits} or {@code radix} is invalid
22+
*/
23+
public static int convertToDecimal(String s, int radix) {
24+
int num = 0;
25+
int pow = 1;
2826

29-
for (int i = s.length() - 1; i >= 0; i--) {
30-
int digit = valOfChar(s.charAt(i));
31-
if (digit >= radix) {
32-
throw new NumberFormatException("For input string " + s);
33-
}
34-
num += valOfChar(s.charAt(i)) * pow;
35-
pow *= radix;
36-
}
37-
return num;
27+
for (int i = s.length() - 1; i >= 0; i--) {
28+
int digit = valOfChar(s.charAt(i));
29+
if (digit >= radix) {
30+
throw new NumberFormatException("For input string " + s);
31+
}
32+
num += valOfChar(s.charAt(i)) * pow;
33+
pow *= radix;
3834
}
35+
return num;
36+
}
3937

40-
/**
41-
* Convert character to integer
42-
*
43-
* @param c the character
44-
* @return represented digit of given character
45-
* @throws NumberFormatException if {@code ch} is not UpperCase or Digit character.
46-
*/
47-
public static int valOfChar(char c) {
48-
if (!(Character.isUpperCase(c) || Character.isDigit(c))) {
49-
throw new NumberFormatException("invalid character :" + c);
50-
}
51-
return Character.isDigit(c) ? c - '0' : c - 'A' + 10;
38+
/**
39+
* Convert character to integer
40+
*
41+
* @param c the character
42+
* @return represented digit of given character
43+
* @throws NumberFormatException if {@code ch} is not UpperCase or Digit character.
44+
*/
45+
public static int valOfChar(char c) {
46+
if (!(Character.isUpperCase(c) || Character.isDigit(c))) {
47+
throw new NumberFormatException("invalid character :" + c);
5248
}
49+
return Character.isDigit(c) ? c - '0' : c - 'A' + 10;
50+
}
5351
}

‎Conversions/AnytoAny.java

+22-22
Original file line numberDiff line numberDiff line change
@@ -1,30 +1,30 @@
11
package Conversions;
22

33
import java.util.Scanner;
4-
//given a source number , source base, destination base, this code can give you the destination number.
5-
//sn ,sb,db ---> ()dn . this is what we have to do .
4+
// given a source number , source base, destination base, this code can give you the destination
5+
// number.
6+
// sn ,sb,db ---> ()dn . this is what we have to do .
67

78
public class AnytoAny {
89

9-
public static void main(String[] args) {
10-
Scanner scn = new Scanner(System.in);
11-
int sn = scn.nextInt();
12-
int sb = scn.nextInt();
13-
int db = scn.nextInt();
14-
int m = 1, dec = 0, dn = 0;
15-
while (sn != 0) {
16-
dec = dec + (sn % 10) * m;
17-
m *= sb;
18-
sn /= 10;
19-
}
20-
m = 1;
21-
while (dec != 0) {
22-
dn = dn + (dec % db) * m;
23-
m *= 10;
24-
dec /= db;
25-
}
26-
System.out.println(dn);
27-
scn.close();
10+
public static void main(String[] args) {
11+
Scanner scn = new Scanner(System.in);
12+
int sn = scn.nextInt();
13+
int sb = scn.nextInt();
14+
int db = scn.nextInt();
15+
int m = 1, dec = 0, dn = 0;
16+
while (sn != 0) {
17+
dec = dec + (sn % 10) * m;
18+
m *= sb;
19+
sn /= 10;
2820
}
29-
21+
m = 1;
22+
while (dec != 0) {
23+
dn = dn + (dec % db) * m;
24+
m *= 10;
25+
dec /= db;
26+
}
27+
System.out.println(dn);
28+
scn.close();
29+
}
3030
}

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