hmmm i got the error char * str - when u declare a string as above in linux the compiler places the string in a read only memory.so if you dont ve access to modify it.so it reports an access violation runt time error ie segmentation fault
On Sun, Aug 7, 2011 at 8:45 PM, Amol Sharma <[email protected]> wrote: > i can see the output coming as f ............. > > http://ideone.com/pB9ga > > but when i ran the same code on ubuntu machine with gcc compiler then it is > also giving segmentation fault i don' t know why.....this is a illustration > taken from K & R page no. 132. > > i don't think there is any need to allocate memory for the string > separately we have declared the variable of a structure which contains a > character pointer....which points to the given string....so where is the > need of allocating memory ?? > > > -- > > > Amol Sharma > Third Year Student > Computer Science and Engineering > MNNIT Allahabad > > > > > On Sun, Aug 7, 2011 at 8:36 PM, sukran dhawan <[email protected]>wrote: > >> oh ya i didnt it sorry :) >> >> >> On Sun, Aug 7, 2011 at 8:29 PM, saurabh singh <[email protected]>wrote: >> >>> And also u have not allocated any space for str...so even if u do wat >>> sukran has suggested u wont get an f... >>> >>> >>> On Sun, Aug 7, 2011 at 8:27 PM, sukran dhawan <[email protected]>wrote: >>> >>>> replace ur code with printf("%c",++(p->str)); >>>> *ptr is a deferenced value.but mere p is a lvalue >>>> >>>> >>>> On Sun, Aug 7, 2011 at 8:23 PM, RAHUL AGARWAL <[email protected]>wrote: >>>> >>>>> #include<stdio.h> >>>>> struct abc{ >>>>> int len; >>>>> char *str; >>>>> }*p; >>>>> main() >>>>> { >>>>> struct abc k; >>>>> k.len=20; >>>>> k.str="echo is your command"; >>>>> p=&k; >>>>> printf("%c",++(*p->str)); >>>>> } >>>>> I expect the output of this code to be "f" but it's displays >>>>> "SEGMENTATION FAULT".. >>>>> PLZ EXPLAIN.WHY? >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Algorithm Geeks" group. >>>>> To post to this group, send email to [email protected]. >>>>> To unsubscribe from this group, send email to >>>>> [email protected]. >>>>> For more options, visit this group at >>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>> >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Algorithm Geeks" group. >>>> To post to this group, send email to [email protected]. >>>> To unsubscribe from this group, send email to >>>> [email protected]. >>>> For more options, visit this group at >>>> http://groups.google.com/group/algogeeks?hl=en. >>>> >>> >>> >>> >>> -- >>> Saurabh Singh >>> B.Tech (Computer Science) >>> MNNIT ALLAHABAD >>> >>> >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Algorithm Geeks" group. >>> To post to this group, send email to [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]. >>> For more options, visit this group at >>> http://groups.google.com/group/algogeeks?hl=en. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Algorithm Geeks" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> For more options, visit this group at >> http://groups.google.com/group/algogeeks?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/algogeeks?hl=en. > -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
