Need Help!!! Can anyone explain

3. #include <stdio.h>
main()
{
char a[20]="Richard";
char *b="Jack";

char *ptr1=a;
char *ptr2=b;

*ptr1=*ptr2;
ptr1++; ptr2++;

*ptr1=*ptr2;
ptr1++; ptr2++;

printf("%s",a);

}


This code runs fine whereas the following code gives a segmentation fault. Can anyone explain why.

#include <stdio.h>
main()
{
char *a="Richard";
char *b="Jack";

char *ptr1=a;
char *ptr2=b;

*ptr1=*ptr2;
ptr1++; ptr2++;

*ptr1=*ptr2;
ptr1++; ptr2++;

printf("%s",a);

}


Thanks..Jack

In the second example, 'a' is a string literal, which cannot be changed. The first example works because 'a' is an array who's contents have been initialized.

Quzah.