mici

Yeah I guess thats true... never had much interest in binary math.
I rather use ints or hex.

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coffee is my heroin.

Daggerhex_Flynn

Binary and Hex are both damn important. Apparently two's compliment is used because processors can recognize, and add two signed numbers efficiently and rapidly. For example, if the leftmost bit is a 0, than the number is positive, and if the leftmost bit is a 1, than the number is negative.

0110 0010 = positve
1000 1010 = negative

And the positive is always a straight calculation, while the negative is a quick inverse, followed by adding one, and than make the value negative.

mici

My mistake!

__________________
coffee is my heroin.

sys0p

OK dude, I see! Ta for explaining!

You mean -min/2 ...

It's OK. I know you are tired!

Yeah it's a fine one!

And just to make sure I understand, is this right:

If we run the following on the command line:

myBigProgram.exe -l 66 -n program.txt

It will look like this:

argc = 5
argv[0] = "myBigProgram.exe";
argv[1] = "-l"
argv[2] = 66
argv[3] = "-n"
argv[4] = "program.txt"

argv[0][0] = 'm'
argv[0][1] = 'y'
argv[0][2] = 'B'
argv[0][3] = 'i'
argv[0][4] = 'g'
argv[0][5] = 'P'
argv[0][6] = 'r'
argv[0][7] = 'o'
argv[0][8] = 'g'
argv[0][9] = 'r'
argv[0][10] = 'a'
argv[0][11] = 'm'
argv[0][12] = '.'
argv[0][13] = 'e'
argv[0][14] = 'x'
argv[0][15] = 'e'

argv[1][0] = '-'
argv[1][1] = 'l'

argv[2][0] = '6' //Is this right, it is a number
argv[2][1] = '6' //Is this right, it is a number

argv[3][0] = '-'
argv[3][1] = 'n'

argv[4][0] = 'p'
argv[4][1] = 'r'
argv[4][2] = 'o'
argv[4][3] = 'g'
argv[4][4] = 'r'
argv[4][5] = 'a'
argv[4][6] = 'm'


I have a feeling this isn't right?

Anyway, thanks guys for your replies! Very much appreciated!
Cheers!

What's that?

mici

You've got it right missy!
A- O.K. (couldn't be better, and I'm not saying that just because you have a nice a.. hmmm avatar).
Actualy doesn't matter if you type a number ... the system still reads it as a char ... later on you convert it with atoi() atof() etc. depending on what kind of num it is...

once again...
no explanation required... you get the point...I'm still tired.

Refers to min and max values for signed chars... DaggerHex_Flyn calculated using binary values and the rule called "two's compliment" that the min value is -128 and max is 127...
(easiest explanation is that you have 256 available values when using 8 bits, out theese 256 values one of them has to be zero therefore it's not possible to have the same number of positive and negative values... thus 127)
If i wasn't clear ... no wories You realy don't need to know or understand this at this point... And if you do, good for you... now quickly forget it (format your drive ) or you'll have nightmares...I know i do... :blink:

__________________
coffee is my heroin.

Daggerhex_Flynn

I have to fix my screw up: Regarding two's compliment:
Maximum positive 8 bit# = 0111 1111 = 1+2+4+8+16+32+64+0 = 127
Simple enought
Maximum negative 8 bit# = 1000 0000 = 0111 1111 = 1000 0000 = 0+0+0+0+0+0+0+128 = -128

So it works perfectly, if you do your addition properly.

sys0p

Ha ha lol!

Sure will do. Thanks for the help guys! Very much appreciated.
Cheers