1. Advanced Data Structure using C++

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LECTURE NOTES OF ADVANCED DATA STRUCTURE (MT-CSE 110) 3. Midsquare method:In this method the primary key value is squared then desire number of digits are extracted from the middle of the squared value to obtain the address e.g.suppose we have a file having 10000 records then we need 4 digits address 0 to 9999 if the key value in (123456) 2 =2895783936 hence computed address is 5783. 4. Truncation method:suppose a nine digit key field is to converted into four digit address the right most four digit of key can be used as a address e.g.key value 747479635 gives the address as 9635. 5. Shifting method:In this method,the outer digits of the key at both ends are shifted inward to overlap by an amount equal to the desired address length.The digits are then added to obtain the address of the record. 6. Folding method:In this method,digits in the key are folded inward like folding paper.The digits are then added to obtain the address. 7. Radix conversion method:In this method,the radix of the key may be converted to another radix,say1<strong>1.</strong>The excess high‐order digits may then be truncated and this number is multiplied by 0.7 to obtain the address. 8. Polynomial method:In this method,each digit of the key is regarded as a polynomial coefficient. Prepared By : Er. Harvinder Singh Assist Prof., CSE, H.C.T.M (Kaithal) Page ‐ 28 ‐
LECTURE NOTES OF ADVANCED DATA STRUCTURE (MT-CSE 110) HASH TABLES In computer science, a hash table or hash map is a data structure that uses a hash function to efficiently map certain identifiers or keys (e.g., person names) to associated values (e.g., their telephone numbers). The hash function is used to transform the key into the index (the hash) of an array element (the slot or bucket) where the corresponding value is to be sought. Prepared By : Er. Harvinder Singh Assist Prof., CSE, H.C.T.M (Kaithal) Page ‐ 29 ‐
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