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Top Forums Programming Correct way to read data of different formats into same struct Post 302940623 by Don Cragun on Tuesday 7th of April 2015 08:33:17 PM
Old 04-07-2015
Isn't this obvious from the code I presented in post #2 in this thread where the fscanf() format string "%s %lf %lf %lf" was able to read four values from one or two lines from format1.dat and able to read four values from four or five lines from format2.dat? And the format string "%s%lf%lf%lf" would have produced the same results but isn't as easy for some people to read.

Have you read the man page for fscanf() recently. Look at it closely. (Characters that are classified as space characters by isspace() are ignored between strings being matched against conversion specifications other than for conversions with a conversion specifier [, c, C, or n.)

Did you try your fscanf() calls in a program? Or, are you just looking at the statements and wondering what they would do? (You could have easily answered this question yourself by putting your code in a program and trying it. And, you could probably have had the results in less time than it took you to type in your post.)
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gets(3C)						   Standard C Library Functions 						  gets(3C)

NAME
gets, fgets - get a string from a stream SYNOPSIS
#include <stdio.h> char *gets(char *s); char *fgets(char *s, int n, FILE *stream); DESCRIPTION
The gets() function reads bytes from the standard input stream (see intro(3)), stdin, into the array pointed to by s, until a newline char- acter is read or an end-of-file condition is encountered. The newline character is discarded and the string is terminated with a null byte. If the length of an input line exceeds the size of s, indeterminate behavior may result. For this reason, it is strongly recommended that gets() be avoided in favor of fgets(). The fgets() function reads bytes from the stream into the array pointed to by s, until n-1 bytes are read, or a newline character is read and transferred to s, or an end-of-file condition is encountered. The string is then terminated with a null byte. The fgets() and gets() functions may mark the st_atime field of the file associated with stream for update. The st_atime field will be marked for update by the first successful execution of fgetc(3C), fgets(), fread(3C), fscanf(3C), getc(3C), getchar(3C), gets(), or scanf(3C) using stream that returns data not supplied by a prior call to ungetc(3C) or ungetwc(3C). RETURN VALUES
If end-of-file is encountered and no bytes have been read, no bytes are transferred to s and a null pointer is returned. For standard-con- forming (see standards(5)) applications, if the end-of-file indicator for the stream is set, no bytes are transferred to s and a null pointer is returned whether or not the stream is at end-of-file. If a read error occurs, such as trying to use these functions on a file that has not been opened for reading, a null pointer is returned and the error indicator for the stream is set. If end-of-file is encoun- tered, the EOF indicator for the stream is set. Otherwise s is returned. ERRORS
Refer to fgetc(3C). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
lseek(2), read(2), ferror(3C), fgetc(3C), fgetwc(3C), fopen(3C), fread(3C), getchar(3C), scanf(3C), stdio(3C), ungetc(3C), ungetwc(3C), attributes(5), standards(5) SunOS 5.10 15 Oct 2003 gets(3C)
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