1. Chapter 4 Selection RECAP

2. IF, ELSE if(Control Statement) { Selection operation } Else { Selection operation }

3. IF ELSE SAMPLE int main() { int age; printf("please enter payment amount "); scanf("%d",&payment); if(payment>50) { payment=payment-10; } else { payment=payment; } printf("please pay %d",payment); }

4. IF, ELSE IF, ELSE If (Control Statement) { Selection operation/action } else if (Control Statement) { Selection operation/action } else { Selection operation/action }

5. IF, ELSE IF, ELSE SAMPLE int main(){ int marks; printf("Enter Marks :"); scanf("%d",&marks); if ( marks<=100 && marks>=80){printf("Your grade is A");} else if ( marks<=79 && marks>=60){printf("Your grade is B");} else if ( marks<=59 && marks>=40){printf("Your grade is C");} else if ( marks<=39 && marks>=20){printf("Your grade is D");} else if ( marks<=19 && marks>=0){printf("Your grade is E");} else{printf("The exam mark must be between 0 and 100 inclusive.");} return 0; }

6. CHAP 4 SWITCH, WHILE LOOP, DO WHILE LOOP,

7. SWITCH CASE Format: Only Integer/ character switch( conditional expression/variable) { case label1: C statement; break; case label2: C statement; break; … default: pernyataanC; } value Exit from option Functioning like else

8. How To Convert this If Else Snippet to Switch? if ( input == 1) printf(“One”); else if (input == 2) printf(“Two”); else if (input == 3) printf(“Three”); else if (input == 4) printf(“Four”); else printf(“Five”);

9. Answer: switch(input) { case 1: printf("One"); break; case 2: printf("Two");break; case 3: printf("Three");break; case 4: printf("Four");break; default: printf("Five");break; }

10. IF-ELSE / SWITCH CASE Side by Side switch(input) { case 1: printf("One"); break; case 2: printf("Two");break; case 3: printf("Three");break; case 4: printf("Four");break; default: printf("Five");break; } if ( input == 1) printf(“One”); else if (input == 2) printf(“Two”); else if (input == 3) printf(“Three”); else if (input == 4) printf(“Four”); else printf(“Five”);

12. Format :IMPORTANT! 1. Counter 2. Counter initialization 3. Conditional expression testing 4. Increment/decrement of counter counter = 0; while (conditional expression) { C statement; counter++; }

14. Must be declared as an integer

15. Used to count amount of loops

16. Can be initialized starting from any value.

18. Used to ensure the loop/repetition is occurred.

19. Example: while ( I < 4)

21. Example: I ++; ++a; y--; :: increment is used if the initial value of counter is less while decrement is used if the initial value of counter is high.

22. Example 1: void main() { int nom1,nom2,nom3,nom4,nom5; printf(“Enter one number :”); scanf(“%d”,&nom1); printf(“nEnter one number:”); scanf(“%d”,&nom2); printf(“nEnter one number:”); scanf(“%d”,&nom3); printf(“nEnter one number:”); scanf(“%d”,&nom1); printf(“nEnter one number:”); scanf(“%d”,&nom5); } void main() { int nom; inti; i =0; while(i <5) { printf(“nEnter one number:”); scanf(“%d”,&nom); i++; } } counter condition increment WHILE LOOP CONVERT

23. Determine the output of the following whileloop statement : a = 1; while ( a <= 5) { printf(“Number %d”,a); a++; }

24. Use do..while statement Repetition will occurred if condition is TRUE Similar to while, must include 3 important things Format : counter = 0; do { C statement; counter++; } while (x < 5); Repeated statements DO-WHILE LOOP

25. DO-WHILE/WHILE DIFFERENCES

26. Example : Converting the following do..while loop to while loop i = 2; j = 1; do { i++; printf(“ i x j = %d”, i * j); } while (i < 8); i= 2; j = 1; while (i < 8) { i++; printf(“ i x j = %d”, i * j); } while do..while DO-WHILE to WHILE LOOP CONVERT

28. Repeat statement until condition is FALSE

29. Similar to while loop, must includes 3 important things

30. Format :for (initial_value; conditional expression ;increment) { C statement; } Repeated statements

31. FOR LOOP SAMPLE intbil, nilai = 3; for (bil = 5; bil >0; bil--) { if( bil % 2 == 1) printf(“ %d”, bil + nilai); }

32. WHILE,DO-WHILE and FOR LOOP side by side

34. A ‘while’ loop is used when the number of times the loop gets executed is not known and the loop should not be executed when the condition is initially false

35. A ‘do while’ loop is used when the number of times the loop gets executed is not known and the loop should be executed even when the condition is initially false