13.1 How can I convert numbers to strings?
13.2 Why does strncpy not always write a '\0'?
13.5 Why do some versions of toupper act strangely if given an upper-case letter?
13.6 How can I split up a string into whitespace-separated fields?
13.7 I need some code to do regular expression and wildcard matching.
13.10 How can I sort a linked list?
13.11 How can I sort more data than will fit in memory?
13.12 How can I get the time of day in a C program?
13.13 How can I convert a struct tm or a string into a time_t?
13.14 How can I perform calendar manipulations?
13.15 I need a random number generator.
13.16 How can I get random integers in a certain range?
13.17 Each time I run my program, I get the same sequence of numbers back from rand().
13.20 How can I generate random numbers with a normal or Gaussian distribution?
13.28 What does it mean when the linker says that _end is undefined?