Changing decimal point

Hey ppl. I am currently doing some coursework at uni and would like some help on the locale.h.

I am reading a line of a csv file into a buffer and then putting each number into a member of a structure. The thing is the numbers are using a comma's as the decimal point instead of a dot. Can someone tell me how i would use the locale.h to change how the decimal point is read.

thanx

maybe this might help?? The simplest solution would be to read the line into a buffer then replace all the commas with a period.

There is other ways to do it but I have been told to try and use the locale.h.

anyway i found this code which tells me what the decimal point is :

Code:

---

#include<stdio.h>
#include<locale.h>

int main()
{
    struct lconv *ptr;
    char *decimal;

    setlocale(LC_ALL, "");
    ptr = localeconv();
    decimal = ptr->decimal_point;
}

---

I fully understand this code but I cant figure out how to change the locale. Can someone please tell me the code to replace the decimal point?

thanx

replacing the comma with a decimal point is pretty trivel. What is the field separator in that file -- probably tabs since commas are used in the numbers?

Code:

---

char *p;
FILE *fp = fopen("somefile.cvs","r");
char iobuf[255]; // or some other bigger or smaller number
while( fgets(iobuf,sizeof(iobuf),fp) )
{
  while( (p = strchr(iobuf,',')) != 0)
        *p = '.';
  // now break the line into its individual fields assumed to be        floating-pointer
  // integers separated by tabs
  p = strtok(buffer,"\t");
  while(p)
  {
    float a = atof(p);
    // put a into whatever struct you want it.
    p = strtok(0,"\t");
  }
}

---

I found that setting local to German will work. But you will want to change it back when done.

Code:

---

#include<stdio.h>
#include<locale.h>
#include <string.h>
#include <math.h>

void rdfile()
{
        float a;
        FILE *fp = fopen("somefile.cvs","r");
        if(fp == 0)
                return;
        while( fscanf(fp,"%f",&a) > 0)
        {
                printf("%f\n",a);
        }
        fclose(fp);

}

int main()
{
    struct lconv *ptr;
    char *decimal;

    setlocale(LC_ALL, "German");
    ptr = localeconv();
    decimal = ptr->decimal_point;
        rdfile();
        return 0;
}

---

[edit]it appears setlocal() does not affect system-wide local setting -- only the currently running program instance. so there is really no need to set it back to original value unless you need it reset for some other reason. [/edit]

thanx for the help. I will just change the country to german.

Can you tell me where I can find a list of locals and the details of each one?

I have no idea. you might read some of the links thatgoogle produces.