Thread: How to read and process+output to file

Hi, newbie here...

I having some problem while read the data from a file and process it..

data file look similar like this
input(shop.txt)
"
Ninxo Department Store
Customer Purchases October 2007

Sim!celine 0123 18 F C 180
clinton!mary 3476 41 F C 850
lee!lester 2134 32 M E 400
tai!june 2453 30 F C 320
foster!liz 1199 27 F H 275

"
Need to read all files and process it to another output file with sum

output file(shop.out)
"
Ninxo Department Store
Customer Purchases October 2007

Sim!celine 0123 18 F C 180
clinton!mary 3476 41 F C 850

Total amount spent = 1030

"
my code as below:
encountered problem for reading in the data by seperate field..
i did try to sscanf by define the '\n' ..but ..

Code:

while ((fgets(stemp, MAX, fp1))!=NULL)
	{
	  if('\n'>3)
	  {
	 sscanf(stemp, "%s %s %s %s %d", &cname,&age, &sex, &type,&amt);
	  printf(">%s< >%s<  >%s<  >%s<  >%d<",cname,age,sex,type,amt);

		}
	  printf(">%s<", stemp);
	  fprintf(fout,"%s",stemp);

	 }

[code]

Your input file seems to have 6 fields, yet you only scan for 5.

Also, you need to read a few lines using another while loop to copy across the store name and date lines without trying to parse them at all.

Your if() doesn't make any sense, but looking at the return result of sscanf() would.

Well given your use of sscanf(), there is no point in doing anything special with the newline at the end of the buffer. So detecting/removing it adds nothing to your code.

Oh, I get it, the first 3 lines are the header (which you just print), and then the rest are parsed.

Code:

int lineNum =  0;
while ((fgets(stemp, MAX, fp1))!=NULL) {
  ++lineNum;
  if ( lineNum > 3 ) {
    // sscanf here
  } else {
    // copy to outfile here
  }
}