strip number from string (c code)

alaios · 09-25-2005, 03:51 AM

Hi imagin plz that we have the following string

200Kbit
300Mbit
100Kb
399Mb

k.l.p

How can i put the integer values into variables and keep the reset part of the string in other variable...
what i want is sth like

int i;
char ch[10];
i=200;
ch="Kbit";

Lux Perpetua · 09-25-2005, 04:58 AM

If all your strings are going to have the form "[number][unit]," then what you can do is "sscanf(str, "%d%s", &i, ch)."

addy86 · 09-25-2005, 05:01 AM

What you are looking for is:
1.) strtol (also returns a pointer to the first invalid (ie. non-numeric) character)
2.) strcpy

alaios · 09-25-2005, 07:05 AM

thx and if i want to do the invert job?
i=20
char="k";

i want to take the string "20k"

addy86 · 09-25-2005, 07:57 AM

fprintf(3)

Lux Perpetua · 09-25-2005, 04:13 PM

Not quite: you are looking for sprintf, not fprintf. sscanf and sprintf are inverses of each other, roughly speaking.

Code:

sprintf(str, "%d%s", i, ch);   /* 'char' can't be the name of your string, by the way */

addy86 · 09-25-2005, 05:03 PM

Oops, typo

You're right.
But it leads to the same man page nevertheless

jlliagre · 09-25-2005, 05:09 PM

Quote:

First they ignore you. Then they laugh at you. Then they fight you. Then you win.

Then you ignore them, then you laugh at them, then you fight with them, then you loose, then they ignore you, ... and so on

addy86 · 09-26-2005, 12:47 AM

Quote:

Originally posted by jlliagre
Then you ignore them, then you laugh at them, then you fight with them, then you loose, then they ignore you, ... and so on

Let's hope that Linux will never really win and thus avoid this fatal fate.