Need Help!!! Can anyone explain

This is a discussion on Need Help!!! Can anyone explain within the C Programming forums, part of the General Programming Boards category; 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); ...

  1. #1
    Registered User
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    Feb 2002
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    Question 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

  2. #2
    ATH0 quzah's Avatar
    Join Date
    Oct 2001
    Posts
    14,826
    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.
    Hope is the first step on the road to disappointment.

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