asked on
stripping non numeric values from char array
say i have an array of chars
char temp[];
strcpy(temp,"$100,000.00")
now i want to just take out all the non numeric values such as $ , and .
the string in temp is not always going to be $100,000.00 , it could be $1,000.00 or $1,000,000.00.
I tried doing something like
if temp[i]>47 && temp[i]<58 {
then do something
}
but it seems to not filter out non numerical values. Do i just have the ascii values wrong or should i be taking a different approach to filtering out the non numerical values?
char temp[];
strcpy(temp,"$100,000.00")
now i want to just take out all the non numeric values such as $ , and .
the string in temp is not always going to be $100,000.00 , it could be $1,000.00 or $1,000,000.00.
I tried doing something like
if temp[i]>47 && temp[i]<58 {
then do something
}
but it seems to not filter out non numerical values. Do i just have the ascii values wrong or should i be taking a different approach to filtering out the non numerical values?
C
Last Comment
evilrix
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error: array size missing in 'temp'
but you can
char temp[100];
strcpy(temp,"$100,000.00")
for(i=j=0;temp[j]=temp[i];
but you can
char temp[100];
strcpy(temp,"$100,000.00")
for(i=j=0;temp[j]=temp[i];
Or strtok it ...
char before[100];
char after [100] = "";
const char * delim = " $,.-";
char * pch;
strcpy(before,"$100,000.00
pch = strtok (before, delim);
while(pch != NULL)
{
strcat(after, pch);
pch = strtok (NULL, delim);
}
char before[100];
char after [100] = "";
const char * delim = " $,.-";
char * pch;
strcpy(before,"$100,000.00
pch = strtok (before, delim);
while(pch != NULL)
{
strcat(after, pch);
pch = strtok (NULL, delim);
}
ASKER
that was so simple. wow.. haha. i didn't even think to look for that
Note that instead of 47 and 58, it's nicer to use '0' and '9' (using <= and >= instead of < and > of course).
If you want to do it in-place by shuffling the bytes down should do it.
NB. I've not tested it thoroughly, I'll leave that as an exercise for you to do :)
NB. I've not tested it thoroughly, I'll leave that as an exercise for you to do :)
#include <ctype.h>
#include <string.h>
void strip(char * p)
{
char *p1 = p;
char *p2 = p;
size_t len = strlen(p);
do
{
if(!isdigit(*p1))
{
while((p2 < &p[len]) && !isdigit(*p2)) { ++p2; };
*p1 = *p2;
*p2 = 0;
}
}
while(++p1 < &p[len]);
}
int main()
{
char temp[] = "$100,000.00";
strip(temp);
}
http://www.cplusplus.com/reference/clibrary/cctype/isalpha.html
http://www.cplusplus.com/reference/clibrary/cctype/isalnum.html