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String pointers

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The output should be 6.

There needs to be a correction on line 5, it should be -   char *p2=p1;

Now, p1 will be incremented till the end of str. So in the end, p1 will be 6.

And there will be no change in p2. So p2=0;

Hence, it will return    p1-p2=6-0=6
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