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user-begginer
Guest
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| mathematics for begginer |
 Posted: Mon Jan 17, 2005 3:09 pm |
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Help me please with this: for lcd - output
I have variable number a=344567 - variable!
I need to make b=44567, or b=4567, or b=567, or 67, or 7 if I know only
were I must do it . for example
a=344567
c=3
then I need b=567;
very begginner. |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Mon Jan 17, 2005 3:33 pm |
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The easiest way is to convert the number to a string using something like itoa() or sprintf(). Then use c as the index to the array.
| Code: |
char buf[16];
char *ptr;
sprintf(buf,"%u",a); // for unsigned int
ptr = &buf[c]; // ptr now points to the string you want
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I don't think you really need the data to be an actual number. If you do, then
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user-begginer
Guest
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| thanks, Mark |
| Posted: Mon Jan 17, 2005 3:49 pm |
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thanks a lot I'm realy need actual - but without any printf and sprintf, for
my output I need only number in unsigned int32 |
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Haplo
Joined: 06 Sep 2003
Posts: 659
Location: Sydney, Australia
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| Posted: Mon Jan 17, 2005 4:56 pm |
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The easiest (but very inefficient) way of doing it is:
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#include <math.h>
c=a%pow(10,b);
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Mon Jan 17, 2005 6:08 pm |
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| If c=1 does b=44567 or 7 |
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user-begginer
Guest
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| Posted: Mon Jan 17, 2005 9:21 pm |
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| b=7; |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Tue Jan 18, 2005 6:48 am |
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Haplo
Joined: 06 Sep 2003
Posts: 659
Location: Sydney, Australia
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| Posted: Tue Jan 18, 2005 3:58 pm |
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Yeah sorry, it was my mistake, it should be
| Code: | #include <math.h>
b=a%pow(10,c); |
Mark, ^ is XOR  |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Tue Jan 18, 2005 7:53 pm |
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Yeah  been programming in VB this week  |
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