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Use tools Make good use of the facilities of the environment where you are debugging For example, a file comparison program like d i f f compares the outputs fmm successful and failed debugging runs so you can focus on what has changed If your debugging output is long, use grep to search it or an editor to examine it Resist the temptation to send debugging output to a printer: computers scan voluminous output better than people do Use shell scripts and other tools to automate the processing of the output from debugging runs Write trivial programs to test hypotheses or confirm your understanding of how something works For instance, is it valid to free a NULL pointer
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f ree(NULL) ; return 0 ;
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Source code control programs like RCS keep track of versions of code so you can see what has changed and revert to previous versions to restore a known state Besides indicating what has changed recently, they can also identify sections of code that have a long history of frequent modification; these are often a good place for bugs to lurk
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Keep records If the search for a bug goes on for any length of time, you will begin to lose track of what you tried and what you learned If you record your tests and results, you are less likely to overlook something or to think hat you have checked some possibility when you haven't The act of writing will help you remember the problem the next time something similar comes up, and will also serve when you're explaining it to someone else
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What do you do if none of this advice helps This may be the time to use a good debugger to step through the program If your mental model of how something works is just plain wrong, so you're looking in the wrong place entirely, or looking in the right place but not seeing the problem a debugger forces you to think differently These "mental model" bugs are among the hardest to find; the mechanical aid is invaluable Sometimes the misconception is simple: incorrect operator precedence, or the wrong operator, or indentation that doesn't match the actual structure, or a scope error where a local name hides a global name or a global name intrudes into a local scope For example, programmers often forge1 that & and I have lower precedence than == and ! = They write
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and can't figure out why this is always false Occasionally a slip of the finger converts a single = into two or vice versa:
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!= EOF)
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Or extra code is left behind during editing:
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f o r (i 0; i < n; i++); = a[i++] = 0;
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switch (c) { case ' < ' : mode = LESS; break; case '>' : mode = GREATER; break; def ual t : mode = EQUAL; break;
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Sometimes the error involves arguments in the wrong order in a situation where type-checking can't help, like writing
memset(p, n, 0) ;
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memset(p, 0, n);
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Sometimes something changes behind your backglobal or shared variables are modified and you don't realize that some other routine can touch them Sometimes your algorithm or data structure has a fatal flaw and you just can't see it While preparing material on linked lists, we wrote a package of list functions to create new elements, link them to the front or back of lists, and so on; these functions appear in 2 Of course we wrote a test program to make sure everything was correct The first few tests worked but then one failed spectacularly In essence, this was the testing program:
while (scanf ("%s %d", name, &value) != EOF) { p = newi tem(name , value) ; l i s t 1 = a d d f r o n t ( l i s t 1 , p) ; l i s t 2 = addend(list2, p) ;
f o r (p = l i s t l ; p ! = NULL; p = p->next) p r i n t f ("%s %d\nW p->name, p->val ue) ; ,