1. Bhushan Mulmule bhushan.mulmule@dotnetvideotutorial.com www.dotnetvideotutorial.com

2. For video visit www.dotnetvideotutorial.com 3. FlowControl Selection Statements If / if else / else if switch - case Loops for while do while for each Jump Statements goto break continue Return throw Agenda 4. Selection Statements A selection statement causes the program control to be transferred to a specific flow based upon whether a certain condition is true or not. The following keywords are used in selection statements: if else switch case default www.dotnetvideotutorial.com 5. If-else The if statement selects a statement for execution based on the value of a Boolean expression. Executes if block if condition is true and else block if condition is false else block is optional www.dotnetvideotutorial.com 6. int no1, no2; Console.Write("Enter Number1: "); no1 = Convert.ToInt32(Console.ReadLine()); Console.Write("Enter Number2: "); no2 = Convert.ToInt32(Console.ReadLine()); if (no1 > no2) { Console.WriteLine("no1 is greater than no2"); } else { Console.WriteLine("no2 is greater than no1"); } if - else Optional www.dotnetvideotutorial.com 7. Nested if-else if-else can be nested either inside other if or else block www.dotnetvideotutorial.com 8. Nested if if (no1 > no2) { Console.WriteLine("no1 is greater than no2"); } else { if(no1 < no2) Console.WriteLine("no2 is greater than no1"); else Console.WriteLine("no1 is equal to no2"); } www.dotnetvideotutorial.com 9. else-if else if can be use to avoid deep nesting in case of multiple conditions www.dotnetvideotutorial.com 10. else if if (no1 > no2) { Console.WriteLine("no1 is greater than no2"); } else if (no2 > no1) { Console.WriteLine("no2 is greater than no1"); } else { Console.WriteLine("no1 is equal to no2"); } www.dotnetvideotutorial.com 11. switch-case The switch statement is a control statement that handles multiple selections and enumerations by passing control to one of the case statements within its body www.dotnetvideotutorial.com 12. switch-case int no1, no2, result = 0; char op; Console.Write("Enter Number1: "); no1 = Convert.ToInt32(Console.ReadLine()); Console.Write("Enter Number2: "); no2 = Convert.ToInt32(Console.ReadLine()); Console.Write("Enter Operator (+,-,*,/): "); op = Convert.ToChar(Console.ReadLine()); www.dotnetvideotutorial.com 13. switch (op) { case '+': result = no1 + no2; break; case '-': result = no1 - no2; break; case '*': result = no1 * no2; break; case '/': result = no1 / no2; break; default: Console.WriteLine("Invalid Operator"); break; } Console.WriteLine("Result = " + result); break is compulsory default is optional 14. Swith-case fallthrough Swith-case fallthrough can be used to execute same block for multiple cases. It can be achived using empty case block www.dotnetvideotutorial.com 15. Console.Write("Enter Ratings (0 to 5): "); int ratings = Convert.ToInt32(Console.ReadLine()); switch(ratings) { case 0: case 1: Console.WriteLine("Poor"); break; case 2: case 3: Console.WriteLine("Average"); break; case 4: Console.WriteLine("Good"); break; } Only empty case allow block without break statement Swith-case fallthrough 16. FlowControl Selection Statements If / if else / else if switch - case Loops for while do while for each Jump Statements goto break continue Return throw Agenda 17. Loops Loop executes a block of code repeatedly until a certain condition is met. C# provides four loops for while do. . .while foreach www.dotnetvideotutorial.com 18. for for (initializer; condition; iterator) { statement(s) } The initializer is the expression evaluated before the first loop is executed The condition is the expression checked before each new iteration of the loop The iterator is an expression evaluated after each iteration www.dotnetvideotutorial.com 19. for for (int i = 0; i < 10; i++) { Console.WriteLine("Hello"); } www.dotnetvideotutorial.com 20. while int i = 0; while(i < 10) { Console.WriteLine(i); i++; } Initializer Condition Iterator www.dotnetvideotutorial.com 21. do...while int i = 0; do { Console.WriteLine("Hello " + i); i++; } while (i < 10); Initializer Condition Iterator www.dotnetvideotutorial.com 22. foreach int[] marks = { 50, 35, 65, 43, 65 }; foreach (int m in marks) { Console.WriteLine(m); } 50 35 65 43 65 m marks www.dotnetvideotutorial.com 23. Nested Loop for (int i = 0; i < 3; i++) { for (int j = 0; j < 5; j++) { Console.WriteLine("i={0} j={1}",i,j); } Console.WriteLine(); } www.dotnetvideotutorial.com 24. FlowControl Selection Statements If / if else / else if switch - case Loops for while do while for each Jump Statements goto break continue Return throw Agenda 25. Jump Statements Branching is performed using jump statements, which cause an immediate transfer of the program control. The following keywords are used in jump statements: break continue goto return throw www.dotnetvideotutorial.com 26. goto static void Main(string[] args) { label1: Console.WriteLine("Do you like this tutorial?"); Console.Write("Enter Y or N: "); char response = Convert.ToChar(Console.ReadLine()); if (response == 'N' || response == 'n') goto label1; Console.WriteLine("O Thanks!!!"); } www.dotnetvideotutorial.com 27. break for (int i = 0; i < 10; i++) { if (i == 6) break; Console.WriteLine("i = " + i); } www.dotnetvideotutorial.com 28. continue for (int i = 0; i < 10; i++) { if (i == 6) continue; Console.WriteLine("i = " + i); } www.dotnetvideotutorial.com 29. Bhushan Mulmule bhushan.mulmule@dotnetvideotutorial.com www.dotnetvideotutorial.com