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Full Discussion: Correct way to read data of different formats into same struct
Top Forums Programming Correct way to read data of different formats into same struct Post 302940450 by Don Cragun on Monday 6th of April 2015 01:46:17 AM
Old 04-06-2015
I guess I don't see your problem.

Changing your program slightly so it will compile, read from standard input instead of from a hardcoded filename, and not overwrite memory following your array if you overflow the array:
Code:
#include <stdio.h>

#define	NMAX	7

typedef struct info
{
  char name[20];
  double test;
  double quiz;
  double English;
} Info;

int main()
{
  int	n = 0;
  int	ret;
  Info	record[NMAX];

  while (n < NMAX && (ret = fscanf (stdin, "%s %lf %lf %lf", 
               record[n].name, &record[n].test,
               &record[n].quiz, &record[n].English)) == 4)
    {
      printf ("%s\t%.2lf\t%.2lf\t%.2lf\n", 
              record[n].name, record[n].test,
              record[n].quiz, record[n].English);
      ++n;
    }
  printf("%d records processed.\n", n);
  printf("return code from last fscanf() call: %d\n", ret);

  return 0;
}

and running it in a directory containing format1.dat and format2.dat from post #1 in this thread as follows:
Code:
$ ./a.out < *1.dat
Zacker	244.00	244.00	542.00
Lee	265.00	265.00	456.00
Walter	235.00	235.00	212.00
Zena	323.00	215.45	332.50
4 records processed.
return code from last fscanf() call: -1
$ ./a.out < *2.dat
Zacker	244.00	244.00	542.00
Lee	265.00	265.00	456.00
Walter	235.00	235.00	212.00
Zena	323.00	215.45	332.50
Mira	285.00	285.00	415.00
5 records processed.
return code from last fscanf() call: -1
$ cat *.dat | ./a.out
Zacker	244.00	244.00	542.00
Lee	265.00	265.00	456.00
Walter	235.00	235.00	212.00
Zena	323.00	215.45	332.50
Zacker	244.00	244.00	542.00
Lee	265.00	265.00	456.00
Walter	235.00	235.00	212.00
7 records processed.
return code from last fscanf() call: 4

This User Gave Thanks to Don Cragun For This Post:
yifangt
 

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LEARN ABOUT SUNOS

iconv_8859-1

iconv_8859-1(5) 					Standards, Environments, and Macros					   iconv_8859-1(5)

NAME

       iconv_8859-1 - code set conversion tables for ISO 8859-1 (Latin 1)

DESCRIPTION

       The following code set conversions are supported:

       +--------------------------------------------------------------------+
       |		  Code Set Conversions Supported		    |
       +--------------+--------+--------------+--------+--------------------+
       |    Code      |Symbol  |Target Code   |Symbol  |   Target Output    |
       +--------------+--------+--------------+--------+--------------------+
       |ISO 8859-1    |8859    |ISO 646       |646     | 7 bit ASCII	    |
       +--------------+--------+--------------+--------+--------------------+
       |ISO 8859-1    |8859    |ISO 646de     |646de   | German 	    |
       +--------------+--------+--------------+--------+--------------------+
       |ISO 8859-1    |8859    |ISO 646da     |646da   | Danish 	    |
       +--------------+--------+--------------+--------+--------------------+
       |ISO 8859-1    |8859    |ISO 646en     |646en   | English ASCII	    |
       +--------------+--------+--------------+--------+--------------------+
       |ISO 8859-1    |8859    |ISO 646es     |646es   | Spanish	    |
       +--------------+--------+--------------+--------+--------------------+
       |ISO 8859-1    |8859    |ISO 646fr     |646fr   | French 	    |
       +--------------+--------+--------------+--------+--------------------+
       |ISO 8859-1    |8859    |ISO 646it     |646it   | Italian	    |
       +--------------+--------+--------------+--------+--------------------+
       |ISO 8859-1    |8859    |ISO 646sv     |646sv   | Swedish	    |
       +--------------+--------+--------------+--------+--------------------+

CONVERSIONS

       The conversions are performed according to the following tables. All values in the tables are given in octal.

   ISO 8859-1 to ISO 646 (7-bit ASCII)
       For the conversion of ISO 8859-1 to ISO 646, all characters not in the following table are mapped unchanged.

       Converted to Underscore '_' (137)
       ---------------------------------
       200 201 202 203 204 205 206 207
       210 211 212 213 214 215 216 217
       220 221 222 223 224 225 226 227
       230 231 232 233 234 235 236 237
       240 241 242 243 244 245 246 247
       250 251 252 253 254 255 256 257
       260 261 262 263 264 265 266 267
       270 271 272 273 274 275 276 277
       300 301 302 303 304 305 306 307
       310 311 312 313 314 315 316 317
       320 321 322 323 324 325 326 327
       330 331 332 333 334 335 336 337
       340 341 342 343 344 345 346 347
       350 351 352 353 354 355 356 357
       360 361 362 363 364 365 366 367
       370 371 372 373 374 375 376 377

   ISO 8859-1 to ISO 646de (GERMAN)
       For the conversion of ISO 8859-1 to ISO 646de, all characters not in the following tables are mapped unchanged.

       +-----------------------------------------------------------------+
       |	       |     Conversions|Performed	 |		 |
       |  ISO 8859-1   |   ISO 646de	|  ISO 8859-1	 |  ISO 646de	 |
       |247	       | 100		|337		 |176		 |
       |304	       | 133		|344		 |173		 |
       |326	       | 134		|366		 |174		 |
       |334	       | 135		|374		 |175		 |
       +---------------+----------------+----------------+---------------+

       Converted to Underscore '_' (137)
       ---------------------------------
       100 133 134 135 173 174 175 176
       200 201 202 203 204 205 206 207
       210 211 212 213 214 215 216 217
       220 221 222 223 224 225 226 227
       230 231 232 233 234 235 236 237
       240 241 242 243 244 245 246
       250 251 252 253 254 255 256 257
       260 261 262 263 264 265 266 267
       270 271 272 273 274 275 276 277
       300 301 302 303	   305 306 307
       310 311 312 313 314 315 316 317
       320 321 322 323 324 325	   327
       330 331 332 333	   335 336 337
       340 341 342 343	   345 346 347
       350 351 352 353 354 355 356 357
       360 361 362 363 364 365	   367
       370 371 372 373	   375 376 377

   ISO 8859-1 to ISO 646da (DANISH)
       For the conversion of ISO 8859-1 to ISO 646da, all characters not in the following tables are mapped unchanged.

       +-----------------------------------------------------------------+
       |		     Conversions Performed			 |
       +---------------+----------------+----------------+---------------+
       |  ISO 8859-1   |   ISO 646da	|  ISO 8859-1	 |     ISO	 |
       +---------------+----------------+----------------+---------------+
       |646da	       |		|		 |		 |
       +---------------+----------------+----------------+---------------+
       |305	       | 135		|345		 |175		 |
       +---------------+----------------+----------------+---------------+
       |306	       | 133		|346		 |173		 |
       +---------------+----------------+----------------+---------------+
       |330	       | 134		|370		 |174		 |
       +---------------+----------------+----------------+---------------+

       Converted to Underscore '_' (137)
       ---------------------------------
       133 134 135 173 174 175
       200 201 202 203 204 205 206 207
       210 211 212 213 214 215 216 217
       220 221 222 223 224 225 226 227
       230 231 232 233 234 235 236 237
       240 241 242 243 244 245 246 247
       250 251 252 253 254 255 256 257
       260 261 262 263 264 265 266 267
       270 271 272 273 274 275 276 277
       300 301 302 303 304	   307
       310 311 312 313 314 315 316 317
       320 321 322 323 324 325 326 327
	   331 332 333 334 335 336 337
       340 341 342 343 344	   347
       350 351 352 353 354 355 356 357
       360 361 362 363 364 365 366 367
       371 372 373 374	       376 377

   ISO 8859-1 to ISO 646en (ENGLISH ASCII)
       For the conversion of ISO 8859-1 to ISO 646en, all characters not in the following tables are mapped unchanged.

       +-----------------------------------------------------------+
       |		  Conversions Performed 		   |
       +-----------------------------+-----------------------------+
       |	ISO 8859-1	     |	       ISO 646en	   |
       +-----------------------------+-----------------------------+
       |243			     |043			   |
       +-----------------------------+-----------------------------+

       Converted to Underscore '_' (137)
       ---------------------------------
       043
       200 201 202 203 204 205 206 207
       210 211 212 213 214 215 216 217
       220 221 222 223 224 225 226 227
       230 231 232 233 234 235 236 237
       240 241 242     244 245 246 247
       250 251 252 253 254 255 256 257
       260 261 262 263 264 265 266 267
       270 271 272 273 274 275 276 277
       300 301 302 303 304 305 306 307
       310 311 312 313 314 315 316 317
       320 321 322 323 324 325 326 327
       330 331 332 333 334 335 336 337
       340 341 342 343 344 345 346 347
       350 351 352 353 354 355 356 357
       360 361 362 363 364 365 366 367
       370 371 372 373 374 375 376 377

   ISO 8859-1 to ISO 646fr (FRENCH)
       For the conversion of ISO 8859-1 to ISO 646fr, all characters not in the following tables are mapped unchanged.

       +-----------------------------------------------------------------+
       |	       |     Conversions|Performed	 |		 |
       |  ISO 8859-1   |   ISO 646fr	|  ISO 8859-1	 |  ISO 646fr	 |
       |243	       | 043		|347		 |134		 |
       |247	       | 135		|350		 |175		 |
       |250	       | 176		|351		 |173		 |
       |260	       | 133		|371		 |174		 |
       |340	       | 100		|		 |		 |
       +---------------+----------------+----------------+---------------+

       Converted to Underscore '_' (137)
       ---------------------------------
       043
       100 133 134 135 173 174 175 176
       200 201 202 203 204 205 206 207
       210 211 212 213 214 215 216 217
       220 221 222 223 224 225 226 227
       230 231 232 233 234 235 236 237
       240 241 242     244 245 246
	   251 252 253 254 255 256 257
	   261 262 263 264 265 266 267
       270 271 272 273 274 275 276 277
       300 301 302 303 304 305 306 307
       310 311 312 313 314 315 316 317
       320 321 322 323 324 325 326 327
       330 331 332 333 334 335 336 337
	   341 342 343 344 345 346
	       352 353 354 355 356 357
       360 361 362 363 364 365 366 367
       370     372 373 374 375 376 377

   ISO 8859-1 to ISO 646it (ITALIAN)
       For the conversion of ISO 8859-1 to ISO 646it, all characters not in the following tables are mapped unchanged.

       +-----------------------------------------------------------------+
       |	       |     Conversions|Performed	 |		 |
       |  ISO 8859-1   |   ISO 646it	|  ISO 8859-1	 |  ISO 646it	 |
       |243	       | 043		|350		 |175		 |
       |247	       | 100		|351		 |135		 |
       |260	       | 133		|354		 |176		 |
       |340	       | 173		|362		 |174		 |
       |347	       | 134		|371		 |140		 |
       +---------------+----------------+----------------+---------------+

       Converted to Underscore '_' (137)
       ---------------------------------
       043
       100 133 134 135 173 174 175 176
       200 201 202 203 204 205 206 207
       210 211 212 213 214 215 216 217
       220 221 222 223 224 225 226 227
       230 231 232 233 234 235 236 237
       240 241 242     244 245 246
       250 251 252 253 254 255 256 257
	   261 262 263 264 265 266 267
       270 271 272 273 274 275 276 277
       300 301 302 303 304 305 306 307
       310 311 312 313 314 315 316 317
       320 321 322 323 324 325 326 327
       330 331 332 333 334 335 336 337
	   341 342 343 344 345 346
	       352 353 354 355 356 357
       360 361 362 363 364 365 366 367
       370     372 373 374 375 376 377

   ISO 8859-1 to ISO 646es (SPANISH)
       For the conversion of ISO 8859-1 to ISO 646es, all characters not in the following tables are mapped unchanged.

       +-----------------------------------------------------------------+
       |	       |     Conversions|Performed	 |		 |
       |  ISO 8859-1   |   ISO 646es	|  ISO 8859-1	 |  ISO 646es	 |
       |241	       | 133		|321		 |134		 |
       |247	       | 100		|347		 |175		 |
       |260	       | 173		|361		 |174		 |
       |277	       | 135		|		 |		 |
       +---------------+----------------+----------------+---------------+

       Converted to Underscore '_' (137)
       ---------------------------------
       100 133 134 135 173 174 175
       200 201 202 203 204 205 206 207
       210 211 212 213 214 215 216 217
       220 221 222 223 224 225 226 227
       230 231 232 233 234 235 236 237
       240     242 243 244 245 246
       250 251 252 253 254 255 256 257
	   261 262 263 264 265 266 267
       270 271 272 273 274 275 276
       300 301 302 303 304 305 306 307
       310 311 312 313 314 315 316 317
       320     322 323 324 325 326 327
       330 331 332 333 334 335 336 337
       340 341 342 343 344 345 346
       350 351 352 353 354 355 356 357
       360     362 363 364 365 366 367
       370 371 372 373 374 375 376 377

   ISO 8859-1 to ISO 646sv (SWEDISH)
       For the conversion of ISO 8859-1 to ISO 646sv, all characters not in the following tables are mapped unchanged.

       +-----------------------------------------------------------------+
       |	       |     Conversions|Performed	 |		 |
       |  ISO 8859-1   |   ISO 646sv	|  ISO 8859-1	 |  ISO 646sv	 |
       |304	       | 133		|344		 |173		 |
       |305	       | 135		|345		 |175		 |
       |311	       | 100		|351		 |140		 |
       |326	       | 134		|366		 |174		 |
       |334	       | 136		|374		 |176		 |
       +---------------+----------------+----------------+---------------+

       Converted to Underscore '_' (137)
       ---------------------------------
       100 133 134 135 136 140
       173 174 175 176
       200 201 202 203 204 205 206 207
       210 211 212 213 214 215 216 217
       220 221 222 223 224 225 226 227
       230 231 232 233 234 235 236 237
       240 241 242 243 244 245 246 247
       250 251 252 253 254 255 256 257
       260 261 262 263 264 265 266 267
       270 271 272 273 274 275 276 277
       300 301 302 303	       306 307
       310     312 313 314 315 316 317
       320 321 322 323 324 325	   327
       330 331 332 333	   335 336 337
       340 341 342 343	       346 347
       350     352 353 354 355 356 357
       360 361 362 363 364 365	   367
       370 371 372 373	   375 376 377

FILES

       /usr/lib/iconv/*.so	       conversion modules

       /usr/lib/iconv/*.t	       conversion tables

       /usr/lib/iconv/iconv_data       list of conversions supported by conversion tables

SEE ALSO

       iconv(1), iconv(3C), iconv(5)

SunOS 5.10							    28 Apr 1997 						   iconv_8859-1(5)
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