Numbers in String to Double

[RAMBO29]

Hi All;
I am new to the world of programming and is stuck on a small part.I am writing a program for a machine which does some measurement.It is done successfully.But the machine returns the value as

READOUT "  -0.01 V,  -0.04 A"  /n

Now I need to seperate the values -0.01 and -0.04 into two double variables like x=0.01 and y=0.04.I tried to copy this string to a character array and seperate it from there.But didnt work.

Any ideas and help is very much appreciated.

Have a nice day and Regards

[zacs7]

Use sscanf() -> http://www.cplusplus.com/reference/c...io/sscanf.html
If you have any probs just ask, but it would be nice if you tried yourself first - otherwise you won't learn

[RAMBO29]

Hi thnx for the function.Didnt know it existed.but I still cant get it into double variables.Besides its the part of a much bigger program tht is already completed.Only this remains to be finished and is so tagging.If u could give a sample would be helpful to get those in to two double variables.

Thnx and regards

[Salem]

If it isn't %, then it stands for itself.

#include <stdlib.h>
#include <stdio.h>

int main ( ) {
    double x, y;
    char buff[] = "READOUT \"  -0.01 V,  -0.04 A\"  \n";
    if ( sscanf( buff, "READOUT \"  %lf V,  %lf", &x, &y ) == 2 ) {
        printf("Success: %f %f\n", x, y );
    }
    return 0;
}

[RAMBO29]

Hi Salem;
Your program works perfectly.Thnx a lot.

Thnx for all those who contributed too

Have a nice day.

[RAMBO29]

Hi Salem;
Thnx a lot for ur code.May I ask if it would also be possible to get the value after 0.01 and 0.04 to a character?
I tried changing the code to character but didnt work.

Kind regards

[zacs7]

#include <stdlib.h>
#include <stdio.h>

int main(void)
{
    double x, y;
    char a, b;
    char buff[] = "READOUT \"  -0.01 V,  -0.04 A\"  \n";

    if(sscanf(buff, "READOUT \"  &#37;lf %c,  %lf %c", &x, &a, &y, &b) == 4)
    {
        printf("Success: %f %c %f %c\n", x, a, y, b);
    }
    return 0;
}

[RAMBO29]

HI Al;
Thnaks for your valuable help.The project finsihed successfully few minutes before

Once again a big sincere thank you.Without your help,I would have doen it

Have a nice time

[RAMBO29]

Hi All;
I am sorry there is a small problem with the code above.

Sometimes it shows the ouput in this format

READOUT "?  -0.01 V,  -0.04 A"  /n

And at that times the above code

if(sscanf(buff, "READOUT \"  %lf %c,  %lf %c", &x, &a, &y, &b) == 4)
    {
        printf("Success: %f %c %f %c\n", x, a, y, b);
    }

doesnt run.Why is tht so?

Regards

[zacs7]

Learn the syntax of sscanf() and friends, it'll save you time and effort.

[RAMBO29]

Hi;
I tried to do tht.With a character to take in the '?'.But as u see it occures only some times.And sscanf() ignores the spaces.


So its possible tht the value comes in 2 ways.

READOUT "  -0.01 V,  -0.04 A"  /n

READOUT "?  -0.01 V,  -0.04 A"  /n

So I changed the format of the program to

#include <stdlib.h>
#include <stdio.h>

int main(void)
{
    double x, y;
    char a, b,c;
    char buff[] = "READOUT \"  -0.01 V,  -0.04 A\"  \n";

    if(sscanf(buff, "READOUT \" %c %lf %c,  %lf %c",&c, &x, &a, &y, &b) == 5)
    {
        printf("Success: %f %c %f %c\n", q,x, a, y, b);
    }
    return 0;
}

But so the variable q can be used to check if its a blank or "?".But it doesnt work.Could you please look through this?

Regards

[Salem]

This is getting close to the limit of what a single sscanf call can achieve.
I hope there are no more optional surprises you've yet to mention.

#include <stdlib.h>
#include <stdio.h>

void test ( const char *buff ) {
    double  x, y;
    char    a, b, c;
    char    q[3];

    printf("Line=&#37;s", buff );
    if ( sscanf(buff, "READOUT %[\"?] %c %lf %c,  %lf %c", q, &c, &x, &a, &y, &b) == 6)
    {
        printf("Success: %s %f %c %f %c\n", q, x, a, y, b);
    }
}

int main ( void ) {
    test( "READOUT \"  -0.01 V,  -0.04 A\"  \n" );
    test( "READOUT \"?  -0.01 V,  -0.04 A\"  \n" );
    return 0;
}

[RAMBO29]

Hi Salem;
I didnt mean to add in "surprises" later on.Just tht the machine showed some strange things after some breakdown which wasnt aticipated.Today is the last day of the project so thee wont be anythng more

So Thanks again to all of those who helped and have a nice day.