Hi, you see undefined behaviour: when you try in C to change a const via a non-const pointer, the compiler is allowed to do anything. However, in C++ it's an error.
Hth, Axel (I Don't have a standard here, so I might be wrong...) Am 02.01.2012 16:40 schrieb "mandeep" <[email protected]>: > oops a little mistake....i got 101,100 output for the following program > written in C. > so here *p again unable to manage value of variable sum. > > I think it's not possible to change the value of variable const sum. > > u can check it out on this link http://codepad.org/ > > #include <stdio.h>int main(){ > int const sum=100; > int *p=∑ > > *p=101; > > printf("%d, %d",*p,sum); > return 0;} > > > On Mon, Jan 2, 2012 at 6:57 PM, Baris Acar <[email protected]> wrote: > >> Shoubhik, what compiler are you using? I think the line: >> >> int *p=∑ >> >> >> Should not compile per the standard. See http://ideone.com/ujHY5 >> >> prog.cpp:5: error: invalid conversion from ‘const int*’ to ‘int*’ >> >> Happy New Year, Gregorian Calendar observers! >> >> Barış >> >> On 2 Jan 2012, at 07:48, mandeep <[email protected]> wrote: >> >> Well,p points to address of variable sum and when we change value of >> *p,then it change value at that address,thats why u got this output. >> >> On 1/2/12, Shoubhik <[email protected]> wrote: >> >> >> int main() >> >> { >> >> int const sum=100; >> >> int *p=∑ >> >> >> *p=101; >> >> >> >> printf("%d, %d",*p,sum); >> >> return 0; >> >> } >> >> >> /* >> >> >> output >> >> >> 101, 101 >> >> >> */ >> >> >> p points to a constant integer variable, then why/how does *p manage >> >> to change the value of sum? >> >> >> -- >> >> You received this message because you are subscribed to the Google Groups >> >> "Google Code Jam" 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/google-code?hl=en. >> >> >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Google Code Jam" 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/google-code?hl=en. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Google Code Jam" 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/google-code?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "Google Code Jam" 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/google-code?hl=en. > -- You received this message because you are subscribed to the Google Groups "Google Code Jam" 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/google-code?hl=en.
