Category: computer science

  • What is 16 bit in different contexts ?

    Refers to the number of bits that can be processedor transmitted in parallel, or the number of bits usedfor single element in a data format. The term is oftenapplied to the following: microprocessor: indicates the width of the registers. A 16-bit microprocessor can process data and memory addresses that are represented by 16 bits. bus […]

  • Algorithms: bit manipulation

  • What is hashing ?

    http://searchsqlserver.techtarget.com/definition/hashing

  • Project Euler Problem 2, solution internals related using ruby debugger

    $ruby -rdebug euler-two.rb Debug.rb Emacs support available. /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:57: RUBYGEMS_ACTIVATION_MONITOR.enter (rdb:1) r /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:57: RUBYGEMS_ACTIVATION_MONITOR.enter (rdb:1) r /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:57: RUBYGEMS_ACTIVATION_MONITOR.enter (rdb:1) next /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:143: RUBYGEMS_ACTIVATION_MONITOR.exit (rdb:1) next euler-two.rb:3:n1, n2 = 1, 2 (rdb:1) next euler-two.rb:4:sum = 0 (rdb:1) print n1 1nil (rdb:1) print n2 2nil (rdb:1) next euler-two.rb:6:while n2 < 4000000 (rdb:1) print n2 2nil (rdb:1) next euler-two.rb:7:sum += […]

  • Project Euler Problem 3, solution internals using python debugger

    $python -m pdb euler-three.py > /home/jeffrin/beautifulwork/lib/euler-three.py(7)() -> ”’ (Pdb) r 6857 –Return– > /home/jeffrin/beautifulwork/lib/euler-three.py(17)()->None -> print n (Pdb) next –Return– > (1)()->None (Pdb) next The program finished and will be restarted > /home/jeffrin/beautifulwork/lib/euler-three.py(7)() -> ”’ (Pdb) next > /home/jeffrin/beautifulwork/lib/euler-three.py(9)() -> n = 600851475143 (Pdb) next > /home/jeffrin/beautifulwork/lib/euler-three.py(11)() -> i = 2 (Pdb) next > /home/jeffrin/beautifulwork/lib/euler-three.py(12)() […]

  • How to write an algorithm to find among natural numbers the sum of multiples of 3 and 5 below 1000 ?

    /* This program has been worked on from http://www.s-anand.net/euler.html */ #include <stdio.h> sofmul() { int n, i; n = 0; for (i = 0 ; i < 1000 ; i++) { if ( !(i % 5) || !(i % 3) ) n = n + i; } printf(“Sum of the multiples of 3 and 5 […]

  • How to write a program to multiply a number by 4 using a bitwise operator ?

    /* Part of this program copied from http://www.sanfoundry.com/c-program-multiply-number-4-using-bitwise-operators/ */ #include <stdio.h> multbitwise() { long number; printf(“Enter an integer: “); scanf(“%ld”,&number); number = number << 2; printf(“Result is %ld \n”,number); } /* http://stackoverflow.com/questions/4456442/interview-multiplication-of-2-integers-using-bitwise-operators */ /* http://www.geeksforgeeks.org/multiply-two-numbers-without-using-multiply-division-bitwise-operators-and-no-loops/ */ /* http://en.wikipedia.org/wiki/Bitwise_operation */

  • Hacking with conversions of decimal and binary

    $./app Sign detection [1] Power of two [2] Counting No. of bits set [3] Set or clear bits without branching[4] Find maximum value[5] Finding least common multiple[6] Finding the greatest commom divisor[7] Finding if a number is an Armstrong number or not[8] Finding if a given number is prime number[9] Finding the number of twin […]

  • How to write an algorithm to reverse an integer ?

    /* Part of this work is copied from http://www.sanfoundry.com/c-program-to-reverse-a-given-number/ */ #include <stdio.h> revint() { long num, reverse = 0, temp, remainder; printf(“Enter the number \n”); scanf(“%ld”,&num); temp = num; while ( num > 0 ) { remainder = num % 10; reverse = reverse * 10 + remainder; num /= 10; } printf(“Given number = […]

  • Hacking with an algorithm to reverse an integer

    $./app Sign detection [1] Power of two [2] Counting No. of bits set [3] Set or clear bits without branching[4] Find maximum value[5] Finding least common multiple[6] Finding the greatest commom divisor[7] Finding if a number is an Armstrong number or not[8] Finding if a given number is prime number[9] Finding the number of twin […]