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I avoid strtok when dealing with empty fields. A few reasons why, and an alternative: #include <stdio.h> #include <stdlib.h> #include <string.h> int main(void) { static const char filename[] = "file.csv"; /* the name of a file to open */ FILE *file = fopen(filename, "r"); /* try to open...

Do you have a missing semicolon in code prior to this?

Whatever is appropriate. One option: strncat: http://c-faq.com/lib/strncpy.html

...and that it does not necessarily null terminate the destination string. But as for "always use strncpy instead of...", I'd say, "No, avoid strncpy as well.

Now, what's the issue with strncpy that you didn't mention -- which also can be dangerous?

#include <stdio.h> #include <stdlib.h> #include <time.h> char *rand_str(char *dst, int size) { static const char text[] = "abcdefghijklmnopqrstuvwxyz" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; int i, len = rand() % (size - 1); for ( i = 0; i < len; ++i ) {...

Perhaps something like this. #include <stdio.h> int main() { const char filename[] = "file.txt"; FILE *file = fopen(filename, "r"); if ( file ) { char dbuf[100]; while ( fgets(dbuf, sizeof dbuf, file) != NULL ) { unsigned int ch; int n...

I think you were closer the first time.

Very similar to code already posted: #include <stdio.h> typedef struct { unsigned char var1[6]; unsigned char var2[6]; } MY_STRUCT; int main(void) { MY_STRUCT my_struct = { {0x00,0x06,0x29,0x77,0xB1,0xAD}, {0x00,0x06,0x29,0x77,0xB1,0xAD}, }; size_t i; for ( i...

http://en.wikipedia.org/wiki/Floating_point#Peculiar_properties_of_floating_point_arithmetic

http://c-faq.com/fp/fpequal.html

line = realloc(line,linesize*sizeof(*line)); http://cboard.cprogramming.com/showthread.php?p=367853#post367853

I generally go with #2, but only have the "public" functions in the header; any "private" functions are then static to the module. What is an example of "all of the information contained within the function's header file"? Generally it should only be necessary data types and such: declarations...

http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1047673478&id=1043284351 p = malloc ( n * sizeof *p );

NOOOOOOoooo!!! [The evil seed begins to grow.] Use a buffer that ought to be "big enough". Use fgets to read input as a string. Examine the string to see if a newline is at the end. If so, there may be excess data. If not, possibly trim the newline. Or do other conversions, if necessary, using...

Or better yet, don't ever use gets and avoid scanf. http://www.eskimo.com/~scs/c-faq.com/stdio/scanfprobs.html http://www.eskimo.com/~scs/c-faq.com/stdio/getsvsfgets.html

You don't cast a string into an int. What value would you expect "hello world" to be? Given your attempts, I might grudgingly suggest this. #include <stdio.h> int main(void) { char text[] = "hello world"; int value = *(int*)text; printf("value = %d\n", value); return 0; } /* my...

Only cursory searching led me to this: http://en.wikipedia.org/wiki/Pollard's_rho_algorithm (link appears to break at apostrophe) And at a quick glance I noticed the use of absolute value. Would this produce your expected outcomes? d = gcd(abs(x-y), n);

Objects with file scope have a lifetime of the entire execution of the program, whether or not they are static. An object at file scope that is static is only visible in the current translation unit (think source code module). If an object with block scope is declared as static, it too will...

That's about what I was coming up with. Mine was like this. #include <stdio.h> #include <stdlib.h> void error_output_quit(const char *errmessage) { puts(errmessage); exit(EXIT_FAILURE); } void *mymalloc(size_t elements, size_t size, const char *msg) { void *dynmem = malloc(elements *...