Lecture03 computer applicationsie1_dratifshahzad
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The document summarizes key concepts from a lecture on computer applications in industrial engineering, including: - Floating point numbers have limited precision that varies by type (e.g. float has 7 digits, double has 15-16 digits). - Arithmetic operators in C# include addition, subtraction, multiplication, division, and modulus. - Relational operators compare values and return true or false, while logical operators combine conditional tests. - Decision structures like if, else if, else and switch statements allow conditionally executing blocks of code.
![Floating point numbers
1/21/2019
Dr.AtifShahzad
7
static void Main(string[] args)
{
float f_no = 0.0f;
double d_no = 0.0d;
decimal m_no = 0.0m;
f_no = 1 / 3f;
d_no = 1 / 3d;
m_no = 1 / 3m;
//place holder
Console.WriteLine("Float no. is {0}", f_no);
Console.WriteLine("Double no. is {0}", d_no);
Console.WriteLine("Decimal no. is {0}", m_no);
}](https://image.slidesharecdn.com/lecture03computerapplicationsie1dratifshahzad-190122085630/85/Lecture03-computer-applicationsie1_dratifshahzad-7-320.jpg)
![if else if statements
1/21/2019
Dr.AtifShahzad
24
int ch = 'X';
if (ch == 'A' || ch == 'a')
{
Console.WriteLine("Vowel [ei]");
}
else if (ch == 'E' || ch == 'e')
{
Console.WriteLine("Vowel [i:]");
}
else if
else](https://image.slidesharecdn.com/lecture03computerapplicationsie1dratifshahzad-190122085630/85/Lecture03-computer-applicationsie1_dratifshahzad-24-320.jpg)
Lecture03 computer applicationsie1_dratifshahzad
- 1. DR ATIF SHAHZAD Computer Applications in Industrial Engg.-I IE-322 LECTURE #03
- 2. Computer Applications in Industrial Engg.-I IE322
- 4. What we will see 1/21/2019 Dr.AtifShahzad Arithmetic Operators & Precedence Relational Operators Increment Operator Prefix & Postfix Notations Comparison and Logical Operators The if Statement The if-else Statement Nested if Statements The switch-case Statement
- 6. Floating point numbers float 4 Bytes 7 digit precision double 8 Bytes 15-16 digit precision decimal 16 Bytes 28-29 digit precision 1/21/2019 Dr.AtifShahzad 6 賊1.510-45 賊3.41038 賊5.010-324 賊1.710308 賊1.010-28 賊7.91028
- 7. Floating point numbers 1/21/2019 Dr.AtifShahzad 7 static void Main(string[] args) { float f_no = 0.0f; double d_no = 0.0d; decimal m_no = 0.0m; f_no = 1 / 3f; d_no = 1 / 3d; m_no = 1 / 3m; //place holder Console.WriteLine("Float no. is {0}", f_no); Console.WriteLine("Double no. is {0}", d_no); Console.WriteLine("Decimal no. is {0}", m_no); }
- 8. ReadLine() 1/21/2019 Dr.AtifShahzad 8 Console.WriteLine("What is your name?"); string name = Console.ReadLine(); Console.WriteLine("Welcome " + name + ", welcome back!");
- 10. Arithmetic Operators * / % + - 1/21/2019 Dr.AtifShahzad 10
- 11. Operators Precedence Example 1/21/2019 Dr.AtifShahzad 11 Write the expression in c# z=pr%q + w/x-y = % +
- 12. Problem Write a program that enters the coefficients a, b and c of a quadratic equation 2 + + = 0 and calculates and prints its real roots. Note that quadratic equations may have 0, 1 or 2 real roots. 1/21/2019 Dr.AtifShahzad 12
- 13. Math Library 1/21/2019 Dr.AtifShahzad 13 Math.Sqrt(56); Math.Pow(b,2);// for 2 Math.Sqrt(Math.Pow(b,2)-4*a*c); // Discriminant
- 15. Relational Operators 1/21/2019 Dr.AtifShahzad 15 Operator Notation in C# Equals == Not Equals != GreaterThan > GreaterThan or Equals >= LessThan < LessThan or Equals <= bool result = 5 <= 6; Console.WriteLine(result); //True
- 16. Increment (Decrement) Operator x=6; x = x + 1; x = x++; x += 1; //CompoundAssignment 1/21/2019 Dr.AtifShahzad 16 x /= 4; // equivalent to x=x/4; x *= 8; // equivalent to x=x*8; x %= 2; // equivalent to x=x%2;
- 17. Prefix & Postfix form ++x; //prefix x++; //postfix 1/21/2019 Dr.AtifShahzad 17 int x = 3; int y = ++x; // x is 4 and y is 4 int x = 3; int y = x++; // x is 4 and y is 3
- 18. Prefix & Postfix form ++x; //prefix x++; //postfix 1/21/2019 Dr.AtifShahzad 18 int x = 3; int y = ++x; // x is 4 and y is 4 int x = 3; int y = x++; // x is 4 and y is 3
- 19. Logical Operators 1/21/2019 Dr.AtifShahzad 19 Operator Notation in C# Logical NOT ! LogicalAND && Logical OR || Logical Exclusive OR (XOR) ^
- 21. if statement 1/21/2019 Dr.AtifShahzad 21 if (condition) { statements; } static void Main() { Console.WriteLine("Enter two numbers."); int biggerNumber = int.Parse(Console.ReadLine()); int smallerNumber = int.Parse(Console.ReadLine()); if (smallerNumber > biggerNumber) { biggerNumber = smallerNumber; } Console.WriteLine("The greater number is: {0}", biggerNumber); }
- 22. if else statement 1/21/2019 Dr.AtifShahzad 22 if (expression) { statement1; } else { statement2; } string s = Console.ReadLine(); int number = int.Parse(s); if (number % 2 == 0) { Console.WriteLine("This number is even."); } else { Console.WriteLine("This number is odd."); }
- 23. Nested if else statements 1/21/2019 Dr.AtifShahzad 23 if (expression) { if (expression) { statement; } else { statement; } } else statement; if (first == second) { Console.WriteLine( "These two numbers are equal."); } else { if (first > second) { Console.WriteLine( "The first number is bigger."); } else { Console.WriteLine("The second is bigger."); } }
- 24. if else if statements 1/21/2019 Dr.AtifShahzad 24 int ch = 'X'; if (ch == 'A' || ch == 'a') { Console.WriteLine("Vowel [ei]"); } else if (ch == 'E' || ch == 'e') { Console.WriteLine("Vowel [i:]"); } else if else
- 25. Switch case statement 1/21/2019 Dr.AtifShahzad 25 switch (day) { case 1: Console.WriteLine("Monday"); break; case 2: Console.WriteLine("Tuesday"); break; case 3: Console.WriteLine("Wednesday"); break; case 4: Console.WriteLine("Thursday"); break; case 5: Console.WriteLine("Friday"); break; case 6: Console.WriteLine("Saturday"); break; case 7: Console.WriteLine("Sunday"); break; default: Console.WriteLine("Error!"); break; }
- 26. Switch case statement 1/21/2019 Dr.AtifShahzad 26 switch (animal) { case "dog" : Console.WriteLine("MAMMAL"); break; case "crocodile" : case "tortoise" : case "snake" : Console.WriteLine("REPTILE"); break; default : Console.WriteLine("There is no such animal!"); break; }
- 27. Practice the programming Practice is a habit. Practice is a routine. Practice does not need to remember. Practice comes by practicing. Practice needs dedication and commitment. 1/21/2019 Dr.AtifShahzad 27
- 29. 1/21/2019 Dr.AtifShahzad 29 NEVER hesitate to contact should you have any question Dr.Atif Shahzad