Thread: Sscanf Issues and getting rid of quotes

Thanks for the information. Should I use fscanf then?

I made a great deal of changes. All I am trying to do now is get 12.50 8 in their variables.

I tried using

Code:

fseek(in,i,SEEK_SET);
    fgets(l,sizeof(l),in);
    sscanf(l,"%f %d",&unit_price,&quantity_in_stock);

unit_price is declared as a double variable.

I get the quantity_in_stock to be 8 but the unit_price is giving me crazy numbers. Any Advice?

Originally Posted by grumpy

sscanf's %s specifier will stop when it encounters a whitespace. Which means it will stop in the middle of "ENGINE PISTON" (just before the P). It will then fail to read subsequent floating point or integral variables, because the 'P' is still there to be read. It is usually a good idea to check scanf's return value as well, to detect errors.

A double quote character in a string literal or in a character literal needs to be escaped with a backslash.

Code:

resule=strtok(name,"\"");

If you have input lines of format

Code:

"15668942" "TOYOTA" "ENGINE PISTON" 12.50 8
"68465245" "NISSAN" "STARTER" 50.20 14
"14134455" "MITSUBISHI" "STEERING WHEEL" 20.00 0
"31457645" "SUBARU" "TURBO" 3000.00 5

then why don't you use something like the following?

Code:

unsigned long  number;
char           model[32];
char           part[24];
double         price;
unsigned int   count;

if (sscanf(line, "\"%lu\" \"%31[^\"]\" \"%23[^\"]\" %lf %u", &number, model, part, &price, &count) >= 5)
    /* You have a valid line, and parsed it into the five variables */
else
    /* The input line does not match the above pattern */

The [ format specifier is like s, except you list either the characters you want, or a caret ^ and the characters you do not accept. The function obviously returns the number of conversions it did, so if it returns less than five, the line did not match the given pattern.

For strings, remember to specify the maximum length that can be stored in the char array. Also remember that that count does not include the terminating '\0', so the number for sscanf() is at least one less than you have reserved.