pointer and string

[manichandra]

why can't we do this ??

int main()
{
char *p="MANI";;
*(p+1)='C';
*(p+2) = 'B';
*(p+3) = 'D';

printf("%s\n",p);
return 0;
}

when we can do this ..

int main()
{
char s[]="MANI";
char *p;
p=s;
*(p+1)='C';
*(p+2) = 'B';
*(p+3) = 'D';
printf("%s\n",s);
printf("%s\n",p);
return 0;
}

 

[xwb]

In the first case, you are trying to change the contents of a constant. It will fall over if you tried

*(p+5) = 'x';

because you haven't allocated the space for it.