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ctcpconstantsbinaryfiles

How to change an array if it is const?

This program reads and writes on a binary file. The professor is asking to switch the value of the source port and destination port. But I know we can not change if it is const, I also get this error. Does anyone know what he means by that or have any idea how I can switch? Thanks a lot.

error: assignment of read-only location ‘*array’

/*array = the array the data is stored.*/
void header(const unsigned char array [], unsigned char filename [])
{
   
}
Solution

  • You can do this through pointers:

    void header(const unsigned char array [], unsigned char filename [])
{
    char *array2 = (char *)array;
    // You can freely modify array2 elements here, resulting in the original array's modification   
}