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# Lab # 3

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### Transcript of "Lab # 3"

1. 1. Lab No. 3saqib.rasheed@mail.au.edu.pk Air University
2. 2. Write a program to check whether a triangle isvalid or not, when the three angles of thetriangle are entered through the keyboard. Atriangle is valid if the sum of all the threeAngles is equal to 180 degrees Air University
3. 3. switch statementThe control statement that allows us to make a decision from the number of choices is called a switch
4. 4. switch ( variable name ) { case „a‟ : statements; case „b‟ : statements; case „c‟ : statements; … }
5. 5. switch statementsswitch ( grade) { case „A‟ : cout << “ Excellent ” ; case „B‟ : cout << “ Very Good ” ; case „C‟ : … … }
6. 6. switch statementscase „A‟ : cout << “ Excellent ” ; … …
7. 7. switch ( grade){ case „A‟ : cout << “ Excellent ” ; case „B‟ : cout << “ Very Good ” ; case „C‟ : cout << “Good ” ; case „D‟ : cout << “ Poor ” ; case „F‟ : cout << “ Fail ” ;}
8. 8. break;
9. 9. switch ( grade ){ case „A‟ : cout << “ Excellent ” ; break ; case „B‟ : cout << “ Very Good ” ; break ; case „C‟ : cout << “Good ” ; break ; case „D‟ : cout << “ Poor ” ; break ; case „F‟ : cout << “ Fail ” ; break ;}
10. 10. default :default : cout << “ Please Enter Grade from „A‟ to „D‟ or „F‟ “ ;
11. 11. Flow Chart of switch statement switch (grade) case ‘A’ : Display “Excellent” case ‘B’ : Display “Very Good” … Default : “……..”
12. 12. int i = 2 ;switch ( i ){ case 1 : cout<<"I am in case 1 n"; break; case 2 : cout<<"I am in case 2 n"; break; case 3 : cout<<"I am in case 3 n"; break; default : cout<<"I am in default n";} Output I am in case 2
13. 13. if (x == 1) switch (x){ {cout << "x is 1"; case 1:} cout << "x is 1";else if (x == 2) break;{ case 2: cout << "x is 2"; cout << "x is 2";} break;else default: { cout << "value of x unknown";cout << "value of x unknown"; }}
14. 14. There are some things that you simply cannot do with a switch. These are: A float expression cannot be tested using a switch Cases can never have variable expressions (for example it is wrong to say case a +3 : ) Multiple cases cannot use same expressions. Thus the following switch is illegal: switch ( a ) { case 3.2 : ... case 1 + 2 : ... }
15. 15. int day; cout<<"Eneter Day Number"; cin>>day;switch (day) { case 1 : cout << "nSunday"; break; case 2 : cout << "nMonday"; break; case 3 : cout << "nTuesday"; break; case 4 : cout << "nWednesday"; break; case 5 : cout << "nThursday"; break; case 6 : cout << "nFriday"; break; case 7 : cout << "nSaturday"; break; default : cout << "nNot an allowable day number"; break;}
16. 16. switch (day) { case 1 : case 7 : cout << "This is a weekend day"; Break 1 break; case 2 : case 3 : case 4 : case 5 : case 6 : cout << "This is a weekday"; Break break; 2 default : cout << "Not a legal day"; break;}
17. 17. char ch ;cout<< "Enter any of the alphabet a, b, or c ";cin>>ch;switch ( ch ){ case a : case A : cout<<"a is an apple" ; break ; case b : case B : cout<<"b as in brain"; break ; case c : case C : cout<<"c as in cookie"; break ; default : cout<<"wish you knew what are alphabets" ;}
18. 18.  Yesand no. Yes, because it offers a better way of writing programs as compared to if, and no because in certain situations we are left with no choice but to use if. The disadvantage of switch is that one cannot have a case in a switch which looks like:  case i <= 20 :
19. 19.  compiler generates a jump table for a switch during compilation during execution it simply refers the jump table to decide which case should be executed . if-elses are slower because they are evaluated at execution time
20. 20. Make a calculator using switch statement It should take two numbers from user. Ask the user the function to perform Display the result Air University
21. 21. QueWrite a menu driven program program in C++using switch statement that contain option asunder.( The Menu should )Enetr 1--> To Find Largest Number Among Three Variables.Enetr 2--> To Find ODD or EVENEnetr 3--> To Find Condition of WaterEnetr 4--> To Find Grade Of Student Air University
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