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Aug 13th, 2007

Program to go from a character string to Binary, Octal, and Hexidecimal

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Ok so far I got this, it takes a string of characters and prints out their binary representations. I am semi new to C++ and I cant for the life of me figure out how to get the hexidecimal and octal representations of the input.

Here is the code so far:

C++ Syntax (Toggle Plain Text)
#include <iostream>
#include <string>
#include <iomanip>
 
using namespace std;
 
void displayBinary(unsigned);
 
 
void main()
{
	string input; 
	cout << "Enter a string: In other words start typing. Use @# for the escape sequence." << endl; 
 
	while(input != "@#")
		{
			getline(cin, input);
 
			for(int i =0; i < input.length(); i++)
			{
				cout << input.at(i) << " = ";
		        displayBinary((unsigned)input.at(i));
			}
 
	cout << endl;
		}
}
 
void displayBinary(unsigned u)
{
	register int b;
 
	for(b = 128; b > 0; b = b/2)
	{
		(u & b)?(cout << '1'):(cout << '0');
	}
	cout << " ";
}
#include <iostream>
#include <string>
#include <iomanip>

using namespace std;

void displayBinary(unsigned);


void main()
{
	string input; 
	cout << "Enter a string: In other words start typing. Use @# for the escape sequence." << endl; 
	
	while(input != "@#")
		{
			getline(cin, input);

			for(int i =0; i < input.length(); i++)
			{
				cout << input.at(i) << " = ";
		        displayBinary((unsigned)input.at(i));
			}
	
	cout << endl;
		}
}

void displayBinary(unsigned u)
{
	register int b;

	for(b = 128; b > 0; b = b/2)
	{
		(u & b)?(cout << '1'):(cout << '0');
	}
	cout << " ";
}

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AdventChildren0

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Aug 13th, 2007

Re: Program to go from a character string to Binary, Octal, and Hexidecimal

Instead of dividing by 2, divide by 8 or 16. That gives you octal and hexadecimal digits, respectively. The most obvious way to get the string is to build it in reverse by chopping off the least significant digit and using it to index an array of suitable translated digits.

C++ Syntax (Toggle Plain Text)
#include <iostream>
#include <string>
 
using namespace std;
 
string changeBase( unsigned int ch, unsigned int base ) {
  const string digits = "0123456789ABCDEF";
 
  string result = "";
 
  while ( ch != 0 ) {
    result = digits[ch % base] + result;
    ch /= base;
  }
 
  return result;
}
 
int main() {
  string s = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 
  for ( string::size_type i = 0; i < s.size(); ++i ) {
    cout<< changeBase( s[i], 8 ) <<"\n";
  }
 
  return 0;
}
#include <iostream>
#include <string>

using namespace std;

string changeBase( unsigned int ch, unsigned int base ) {
  const string digits = "0123456789ABCDEF";

  string result = "";

  while ( ch != 0 ) {
    result = digits[ch % base] + result;
    ch /= base;
  }

  return result;
}

int main() {
  string s = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

  for ( string::size_type i = 0; i < s.size(); ++i ) {
    cout<< changeBase( s[i], 8 ) <<"\n";
  }

  return 0;
}

Hamrick

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Aug 13th, 2007

Re: Program to go from a character string to Binary, Octal, and Hexidecimal

I tried to use that code to see what the outcome with but but it blew up with alot of errors.

Last edited by AdventChildren0; Aug 13th, 2007 at 8:48 pm.

AdventChildren0

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Aug 13th, 2007

Re: Program to go from a character string to Binary, Octal, and Hexidecimal

What errors did you get?

Hamrick

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Aug 13th, 2007

Re: Program to go from a character string to Binary, Octal, and Hexidecimal

nvm the errors cleared but the problem is it gives out 32 outputs. (your code) I assume 1-26 = A-Z but what is the other 6? Also your code isnt very practical to use with the code I presented. I would have to re-engineer your code to put it into my program.

Last edited by AdventChildren0; Aug 13th, 2007 at 9:19 pm.

AdventChildren0

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Aug 13th, 2007

Re: Program to go from a character string to Binary, Octal, and Hexidecimal

C++ Syntax (Toggle Plain Text)
#include <iostream>
#include <string>
using namespace std ;
 
int main()
{
  string str ;
  getline( cin, str ) ;
  cout << str << '\n' ;
 
  cout << oct << showbase ;
  for( size_t i=0 ; i<str.size() ; ++i ) cout << int( str[i] ) << ' ' ;
  cout << '\n' ;
 
  cout << hex << showbase ;
  for( size_t i=0 ; i<str.size() ; ++i ) cout << int( str[i] ) << ' ' ;
  cout << '\n' ;
}
#include <iostream>
#include <string>
using namespace std ;

int main()
{
  string str ;
  getline( cin, str ) ;
  cout << str << '\n' ;
  
  cout << oct << showbase ;
  for( size_t i=0 ; i<str.size() ; ++i ) cout << int( str[i] ) << ' ' ;
  cout << '\n' ;

  cout << hex << showbase ;
  for( size_t i=0 ; i<str.size() ; ++i ) cout << int( str[i] ) << ' ' ;
  cout << '\n' ;
}

vijayan121

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Aug 14th, 2007

Re: Program to go from a character string to Binary, Octal, and Hexidecimal

Click to Expand / Collapse Quote originally posted by AdventChildren0 ...

nvm the errors cleared but the problem is it gives out 32 outputs. (your code) I assume 1-26 = A-Z but what is the other 6?

The output should have been the characters 'A' to 'Z' in octal, 101-132 (that's 26 numbers, not 32). What output did you get? did you run the example exactly as it was shown?

This is what I got when I ran Hamrick's program (Copy & pasted from console output window)

C++ Syntax (Toggle Plain Text)
101
102
103
104
105
106
107
110
111
112
113
114
115
116
117
120
121
122
123
124
125
126
127
130
131
132
101
102
103
104
105
106
107
110
111
112
113
114
115
116
117
120
121
122
123
124
125
126
127
130
131
132

Quote ...

Also your code isnt very practical to use with the code I presented. I would have to re-engineer your code to put it into my program.

Don't expect people to provide complete copy & paste examples that you can just use without thinking. If you can understand what's going on in the example, it should be a piece of cake for you to change the code to suit your program, otherwise, point out the bits that you're struggling with and someone might be able to guide you further.

Bench

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No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

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