By Ben Klemens
If you happen to understand how to software with a normal function language reminiscent of Ruby or Python, it's also possible to easy methods to use the c programming language in a pragmatic and sleek type. notwithstanding, you wish many strategies which are totally absent from each C textbook out there- other than this one. "21st Century C" assembles all of the instruments you must write effective, state of the art courses with C.
You’ll get to understand the amenities of your shell, makefiles, excellent textual content editors, debuggers, and reminiscence checkers in addition to counsel that exhort you to throw out the instruments that essentially made experience at the mainframes of outdated, akin to the swap assertion or the scary malloc().
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Extra info for 21st Century C: C Tips from the New School
Program_using_VAR ; fi will fail with an obscure syntax error. /program_using_VAR ; fi • As in the above makefile, you can set the variable at the head of the makefile, with the lines like CFLAGS=.... • make will let you set variables on the command line, independent of th shell. Thus, these two lines are close to equivalent: make CFLAGS="-g -Wall" CFLAGS="-g -Wall" make Set a makefile variable. Set an environment variable that only make and its children see. All of these means are equivalent, as far as your makefile is concerned, with the exception that child programs called by make will know new environment variables but won’t know any makefile variables.
About that always: there is virtually no cost to running a program under the debugger. Nor is the debugger just something to pull out when something broke. ’'1 It’s great being able to pause anywhere, increase the verbosity level with a quick print verbose++, force out of a for (int i=0; i< 10; i++) loop via print i = 100 and continue, or test a function by throwing a series of test inputs at it. The fans of interactive languages are right that interacting with your code improves the development process all the way along; they just never got to the debugging chapter in the C textbook, and so never realized that all of those interactive habits apply to C as well.
Using a debugger | 49 Example 3-1. A set of macros to easily display a linked list in GDB. About the most elaborate debugging macro you’ll ever need. (gdb_showlist) define phead set $ptr = $arg1 plistdata $arg0 end document phead Print the first element of a list. , given the declaration Glist *datalist; g_list_add(datalist, "Hello"); view the list with something like gdb> phead char datalist gdb> pnext char gdb> pnext char This macro defines $ptr as the current pointed-to list struct, and $pdata as the data in that list element.