segmentation fault doubt

[isaisa]

hi all
i am getting the segmentation fault when i try to execute the code mentioned below. is there any specific in the storage of string literal that is causing this ?

    char *str1;
    str1=(char *) malloc (100);
    str1="hello";
    cout<<str1;
    free(str1);
    cout<<str1;
    return 0;

can anybody explain me the reason and how the constants are alloted memory ?

thanks in advance

sanjay

 

[Salem]

> str1="hello";
Yes, this overwrites the pointer you allocated.
So when you call free(), it isn't what you malloc'ed.

Try
strcpy( str1, "hello" );

Also, your 2nd cout is invalid, you can't reference memory after you have called free(). Sure, it might 'work' here, but sooner or later, your code will be in big trouble.

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