Binary to decimal for particular bits


 
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# 1  
Old 05-14-2014
Binary to decimal for particular bits

Hello,
I have script which work fine [1] on particular data.file [2].
The next feature I want to achieve is to get the decimal equivalent of data[25] to data[31].
The data looks like this :
Code:
data(01000000000000000000110000000000)

thank you..

[1]
Code:
#include <iostream>
#include <fstream>
#include <sstream>
#include <bitset>
#include <string>
#include <limits>
#include <stdlib.h>
using namespace std;

int main(int argc, char *argv[])
{
  string data16, data32;
  unsigned value;
  bool dodebug = true;

  //open datafile
  std::fstream datafile;
  datafile.open("file.dat",std::fstream::in);

  stringstream ss;
  while(!datafile.eof()) {
    ss.clear();
    datafile >> ws;
    datafile >> data16;
    datafile >> data32;
    if(dodebug)   cout<<"data :"<< data16<< ", "<< data32<<endl;
    
    ss << std::hex << data16 << data32;
    ss >> value;
    bitset<32> data(value);
  }
}

[2]
Code:
file.dat:
A0A0
3E01
0400
2A03
C010

# 2  
Old 05-14-2014
If by data[25] to data[31] you mean the 7 LSB of value, try:
Code:
bitset<7> trimmedData(value);
unsigned long decOfTrimmedData = trimmedData.to_ulong();

If you want MSB
Code:
data >>= 25;
unsigned long decOfTrimmedData = data.to_ulong()

This User Gave Thanks to chacko193 For This Post:
# 3  
Old 05-14-2014
I'm afraid your file.dat holds only 16bit data.
# 4  
Old 05-14-2014
Quote:
Originally Posted by RudiC
I'm afraid your file.dat holds only 16bit data.
That maybe, but she is using them two at time
This User Gave Thanks to chacko193 For This Post:
# 5  
Old 05-14-2014
I didn't read OP's other thread, and I didn't look too deep into the code. Rats!
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