question binary representations

[gdarian216]

im doing conversions with two's complement binary numbers and i have some questions.

how can I convert -2047 into a base 2 complement number? I know how to read the binary but there has to be a way to convert it I just don't know how.

I also was trying to figure out how to convert MIPS binary representation for the floating-point number 0.1.

also i solved these and wanted to make sure I was understanding the concepts.
if this is the binary

1111 1111 1111 1111 1111 1111 0000 0110

then the number represented is -248

im also doing adding and subtracting
if have two numbers

0000 0000 0000 0000 0000 0000 0101 1011
0000 0000 0000 0000 0000 0000 0000 1101

then the added number in binary would be

0000 000 0000 0000 0000 0000 0110 0000

using the same numbers but using the negative of the second one from above, then adding the two

0000 0000 0000 0000 0000 0000 0101 1011
1111 1111 1111 1111 1111 1111 1111 0010

with these two numbers I get

0000 0000 0000 0000 0000 0000 0100 1110

[Banfa]

how can I convert -2047 into a base 2 complement number? I know how to read the binary but there has to be a way to convert it I just don't know how.

I also was trying to figure out how to convert MIPS binary representation for the floating-point number 0.1.

Store the number in a variable, the read the bits out of of the variable (if it's an integer) or read the bits from it's memory locations (it it's a float).

1111 1111 1111 1111 1111 1111 0000 0110

then the number represented is -248

No it repreents -250

[quote=gdarian216]
im also doing adding and subtracting
if have two numbers

0000 0000 0000 0000 0000 0000 0101 1011
0000 0000 0000 0000 0000 0000 0000 1101

then the added number in binary would be

0000 000 0000 0000 0000 0000 0110 0000

[/code]Wrong it would be

0000 000 0000 0000 0000 0000 0110 1000

OK the thing to remember is that your computer only uses a binary represenation of any number, usually 2's complement for an integer. To your computer -2047 is just a series of 5 characters, it does not understand or use decimal. What it knows is how to convert it's binary representation into a decimal one when displaying data for the user. The compiler also knows how to convert decimal into binary when it is compiling a program.

As such reading the binary representation of -2047 is trivially easy, assign the value to a variable

int value = -2047;
 

Then use the shift and bitwise operators to read out a string of binary digits from value.

[lucky26ph]

caN U HELP ME WITH THIS..input an integer containing only 0 and 1 binary number and prints its decimal equivalent..help give me to solve this problem give the codes on this problem..tnx..

[weaknessforcats]

caN U HELP ME WITH THIS..input an integer containing only 0 and 1 binary number and prints its decimal equivalent..help give me to solve this problem give the codes on this problem..tnx..

Please start your own thread. Hijacking someone else's is rude.

[weaknessforcats]

how can I convert -2047 into a base 2 complement number? I know how to read the binary but there has to be a way to convert it I just don't know how.

You:
1) Start with 2047
2) reverse 1's and 0's
3) add 1
4) voila!

If you start with -2047 in 2's complement then the abve will covert it back to 2047.

[gdarian216]

Store the number in a variable, the read the bits out of of the variable (if it's an integer) or read the bits from it's memory locations (it it's a float)

how would the bitwise function help.........i wrote a short program

#include<iostream>
using namespace std;
 
int main()
{
 
float i = 0.0;
i = 0.1;
cout << &i;
 
}

and i get 0xbfe392f4-

how would i get the bit value?