engineering notes

 Database Management System  A database is an organized collection of data. A Database Management System is a collection of interrelated data and a set of programs to access those data. The main purpose of DBMS is to provide a way to store and retrieve database information that is both convenient and efficient. Management of data involves both defining structures for the storage of information and providing mechanisms for the manipulation of information. In addition, the database system must ensure safety crashes or attempts at unauthorized access. Applications of Database System Banking: For customer information, accounts, and loans, and banking transactions. Airlines: For reservations and schedule information. Airlines were among the first to use databases in a geographically distributed manner. Terminals situated around the world accessed the central database system through phone lines and other data networks. Credit card transactions: For purchase on credit cards and generation of

  using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace function { Class Program { static void main(string[] args) { prime_comp(); factorial(); odd_even(); } static public void odd_even() { int n; Console.WriteLine("Input any number."); n= Convert.ToInt32(Console.ReadLine()); if (n%2==0) { Console.WriteLine("The number is even."); } else { Console.WriteLine("The number is odd."); } Console.ReadLine(); } static public void factorial() { int n, i, fact = 1; Consol.WriteLine("Input any number."): n  = Convert.ToInt32(Console.ReadLine()): for(n==0) { Console.WriteLine("The factorial of 0 is 1"); } else{ for(i=1; i<=n; i++) { fact = fact * i; } Console.WriteLine("The factorial of given number is: {0}",fact); } } static public void prime_comp() { int num, flag = 0; Console.WriteLine("Input any number."); num = Convert.ToInt32(Console.ReadLine()); fo

a). 1, 5, 10 ,15, 20 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace series1 { Class Program { static void main(string[] args) { int n, i=1, mul=1; Console.WriteLine("How many number."); n = Convert.ToInt32(Console.ReadLine()); Console.WriteLine("{0}",i); for(i = 1; i<=n ;i++) { mul = i* 5; Console.WriteLine("{0}", mul); } Console.ReadLine(); } } } OUTPUT: How many numbers. 5 1 5 10 15 20 25 b). 0, 2, 4, 6 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace series2 { Class Program { static void main(string[] args) { int n, i; Console.WriteLine("Enter how many terms."); n= Convert.ToInt32(Console.ReadLine()); for(i=0; i<n; i++) { if (i%2 == 0) { Console.WriteLine("{0}", i); } Console.ReadLine(); } } } OUTPUT:  Enter how many terms. 8 0 2 4 6 c). 0, 1, 1, 2, 3, 5,7...... using System

  using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Multiplication_Table { Class Program { static void main(string[] args) { int i, n, mul; Console.WriteLine("Input any number."); n= Convert.ToInt32(Console.ReadLine()): Console.WriteLine("The multiplication table of {0} is : ", n) for(i=1; i<=0; i++) { mul = n* i Console.WriteLine("{0}", mul); } Console.ReadLine(); } } } OUTPUT: Input any number. 5 The multiplication table of 5 is : 5 10 15 20 25 30 35 40 45 50

  using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace factorial { Class Program { static void main(string[] args) { int fact = 1, i, n; Console.WriteLine("Input any number."); n = Convert.Toint32(Console.ReadLine()); if( n == 0) { Console.WriteLine("The factorial of 0 is 1."); Console.ReadLine(); } else  { for(i=1; i<=n; i++) { fact = fact*i; } Console.WriteLine("The factorial of a given number is: {0}", fact); Console.ReadLine(); } } } } OUTPUT: Input any number.  5 The factorial of a given number is: 120

  using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace swap { Class Program { static void main(string[] args) { int A, B, C; Console.WriteLine("Input first number."); A= Convert.ToInt32(Console.ReadLine()); Console.WriteLine("Input second number."); B= Convert.ToInt32(Console.ReadLine()); Console.WriteLine("The number before swapping are : A={0} B= {1}", A,B) C= A; A= B; B = C; Console.WriteLine("The number after swapping are: A={0}  B = {1}", A,B); Console.ReadLine(); } } } OUTPUT: Input first number. 5 Input second number. 6 The number before swapping are : A = 5  B = 6 The number after swapping are : A= 6      B= 5

  using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace sum_odd { Class Program { static void main(string[] args) { int i, sum = 0; Console.WriteLine("The first five odd numbers are:"); for(i=1; i<10; i++) { if (i%2 != 0) { Console.WriteLine("{0}",i); sum = sum +i; } } Console.WriteLine("The sum of the first five odd number is :{0}",sum); Console.ReadLine(); } } } OUPUT: The first five odd numbers are: 1 3 5 7 9 The sum of the  first five odd number is : 25

  using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace sum_even { Class Program { static void main(string[] args) { int i, sum=0; Console.WriteLine("The first  five even numbers are: "); for(i=0; i<12; i++) { if (i%2 == 0) { Console.WriteLine("{0}",i); sum = sum +i; } } Console.WriteLine("The sum of  the first five even numbers is :{0}",sum); Console.ReadLine(); } } } OUTLINE: The first five even numbers are: 2 4 6 8 10 The sum of the first five even numbers is 30

  using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace natural_sum { Class Program { static void main(string[] args) { int n, i, sum= 0; Console.WriteLine("How many numbers."); n = Convert.ToInt32(Console.ReadLine()); for (i= 1; i<= n; i++) { sum = sum +1; } Console.WriteLine("The sum of n natural numbers is : {0}", sum); Console.ReadLine(); } } } Output: How many numbers. 4 The sum of n natural number is: 10

  using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace reverse { Class Program { static void main(string[] args) { int n, reverse=0 , rem; Console.WriteLine("Enter a number"); n= Conver.ToInt32(Console.ReadLine()); while(n!=0) { rem = n%10; reverse = reverse*10 +rem; n = n/10; } Console.WriteLine("The reversed number is : {0}", reverse); Consoel.ReadLine(); } } } OUTPUT: Enter a number 567 The reversed number is : 756 

  using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace selected_days { Class Program { static void main(string[] args) { int weeknumber; Console.WriteLine("Enter week number (1-7):"); switch (weeknumber) { case 1: Console.WriteLine("Sunday"); break; case 2: Console.WriteLine("Monday"); break; case 3:  Console.WriteLine("Tuesday"); break; case 4: Console.WriteLine("Wednesday"); break; case 5: Console.WriteLine("Thursday"); break; case 6: Console.WriteLine("Friday"); break; case 7: Console.WriteLine("Saturday"); break; } Console.ReadLine(); } } } OUTPUT: Enter week number (1-7): 5 Thursday

  using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace switch_case { Class Program { static void main(string[] args) { double a, b; Console.WriteLine("Input first number."); a= Convert.Todouble(Console.ReadLine()); Cosole.WriteLine("Input second number."); b= Convert.Todouble(Console.ReadLine()); Console.WriteLine("1.Addition"); Console.WriteLine("2.Subtraction"); Console.WriteLine("3.Multiply"); Console.WriteLine("4.Division"); int c = Convert.ToInt32(Console.ReadLine()); Switch (c) { Case 1: { Console.WriteLine("Addition of two numbers : {0}", (a+b)); break; Case 2: Console.WriteLine("Subtraction of two numbers:{0}", (a-b)); break; Case 3: Console.WriteLine("Multiplication of two numbers : {0}",(a*b)); break; Case 4: Console.WriteLine("Division of two numbers : {0}", (a/b)); break; } Console.ReadLine(); } } } Outp

  using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace  Positive_negative { Class Program { static void main(string[] args) { double a; Console.WriteLine("Input any number."); a= Convert.ToDouble(Console.ReadLine()); if(a>0) { Console.WriteLine("The number is Positive."); } else { Console.WriteLine("The number is negative."); } Console.ReadLine(); } } } OUTPUT: Input any number. 5 The number is Positive.

  using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace greatest { Class Program { static void main(string[] args) { double a, b, c; Console.WriterLine("Please input three numbers."); a=Convert.Toint32(Console.ReadLine()); b=Convert.Toint32(Console.ReadLine()); c=Convert.Toint32(Console.ReadLine()); if(a>b && a>c) { Console.WriteLine("The greatest number is:{0}",a); } else if (b>a && b>c) { Console.WriteLine("The greatest number is:{0}",b); } else { Console.WriteLine("The greatest number is: {0}",c); } Console.ReadLine(); } } } OUTPUT: Please input three numbers.  5 6 7 The greatest number is: 7