help needed in converting hex to float......

[mirangk]

Heyy Guys...
Im very new to vb.
Im using vb6 and i want to convert a 32 bit ieee 754 number into a floating point number.
for example.
'BE C3 F2 DF' (in hexa representation) should be converted to -0.382712....

i have worked this c++ code over which seems to be running fine.
Need to convert the code in VB.
please help me guys.

#include<iostream.h>
#include<conio.h>
 
 
void main()
{
//clrscr();
unsigned long int number,value;
int mantissa,exponent;
long int sign;
cout<<"ENTER THE NUMBER.APPEND 0X BEFORE A HEX NUMBER :"<<endl;
cin>>number;
sign=number & 0x80000000;
if(sign==0x80000000) //most significant bit is 1
{
sign=-1;
}
else sign=1;
//cout<<number<<endl;
//mantissa=number & 0x7F800000;
mantissa=number>>23;
mantissa=mantissa & 0xFF;
//cout<<mantissa<<endl;
exponent=mantissa-127;
//cout<<exponent;
value=number & 0x007FFFFF;//extract the characteristic
//cout<<value;
long int mask=0x00800000;
long int masked;
double charac,flot;
for(int i=1;i<24;i++)
{
masked=value & mask;
//cout<<mask<<endl;
if (masked==mask)//value at that bit is 1
{
flot=1.0;
for(int k=0;k<i-1;k++)
{
flot=flot*0.5;
//cout<<flot<<endl;
}
charac=charac+flot;
//cout<<(1/pow(2,i))<<endl;
//cout<<charac<<endl;
}
mask=mask>>1;
 
}
charac=charac+1.0;
//cout<<"charac"<<charac<<endl;
//cout<<"exponent"<<exponent;
float multiplier;
multiplier=1.0;
if(exponent>0)
{
for(i=0;i<exponent;i++)
{
multiplier=multiplier*2;
}
}
if(exponent<0)
{
exponent=exponent*-1;
for(i=0;i<exponent;i++)
{
multiplier=multiplier*2;
}
multiplier=1/multiplier;
}
charac=charac*multiplier*sign;
cout<<charac;
getch();
}
 
 

The funny thing is, the same code when executed in VC++, gives different output. Any views on that...

[willakawill]

Hi. Looks like your question is too involved. Try the solution yourself and come back if you are stuck.

[Killer42]

Hi. Looks like your question is too involved. Try the solution yourself and come back if you are stuck.

A good first step would be to work out (and write down) what the C++ program does, step by step. Once you do that, it should be quite simple to convert the individual steps to VB. And it will ensure that you understand the process.

Of course, given the different capabilities of different languages, the process may end up somewhat different. But the better you understand it, the easier it will be.

[mirangk]

thanks to everyone.
i finally found d solution using the powerful copymemory( ) function.
thank u again for your efforts.

[willakawill]

thanks to everyone.
i finally found d solution using the powerful copymemory( ) function.
thank u again for your efforts.

Congratulations . I thought you would never find an answer to this.