App Dev Worksheet: If Else Rules

App development lesson 18: if / else: app rules · Set 682 · 40 questions

Developer's tip (Test, then choose): if (test) { A } else { B }: A runs when the test is true, B when it is false. else if: check from the top; the first true test wins and the rest are skipped. >= includes the number itself; > does not. === tests “is equal to”.

1. 1.🔀 What does if / else let an app do? (a) repeat forever (b) save a photo (c) draw a screen (d) pick one of two actions
2. 2.🔀 What does this battery rule show?
   let battery = 84;
   if (battery < 20) {
     show("Low battery");
   } else {
     show("Battery OK");
   } (a) Low battery (b) Battery OK
3. 3.🔀 What does this battery rule show?
   let battery = 6;
   if (battery < 20) {
     show("Low battery");
   } else {
     show("Battery OK");
   } (a) Low battery (b) Battery OK
4. 4.🔀 In this course’s code, which sign tests “is equal to”? (a) === (b) => (c) !== (d) =
5. 5.🔀 What does this battery rule show?
   let battery = 13;
   if (battery < 20) {
     show("Low battery");
   } else {
     show("Battery OK");
   } (a) Battery OK (b) Low battery
6. 6.🔀 With if / else if / else, how many parts run? (a) all of them (b) only one (c) none (d) two
7. 7.🔀 Which badge does this quiz app show?
   let marks = 42;
   if (marks >= 80) {
     show("Gold");
   } else if (marks >= 50) {
     show("Silver");
   } else {
     show("Bronze");
   } (a) Bronze (b) Silver (c) Gold
8. 8.🔀 When does the else part run? (a) never (b) when the test is false (c) always (d) when the test is true
9. 9.🔀 What does this battery rule show?
   let battery = 17;
   if (battery < 20) {
     show("Low battery");
   } else {
     show("Battery OK");
   } (a) Low battery (b) Battery OK
10. 10.🔀 Which badge does this quiz app show?
    let marks = 76;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    } (a) Bronze (b) Gold (c) Silver
11. 11.🔀 What does this battery rule show?
    let battery = 23;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Low battery (b) Battery OK
12. 12.🔀 What number does this shop app show?
    let total = 240;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
13. 13.🔀 What does this PIN rule show?
    let pin = "933";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) PIN saved (b) Use 4 digits
14. 14.🔀 What does this battery rule show?
    let battery = 2;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Low battery (b) Battery OK
15. 15.🔀 What does this battery rule show?
    let battery = 26;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Low battery (b) Battery OK
16. 16.🔀 What does this battery rule show?
    let battery = 49;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Battery OK (b) Low battery
17. 17.🔀 What does this sign-up rule show?
    let age = 8;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Ask a parent (b) Welcome!
18. 18.🔀 What does this PIN rule show?
    let pin = "67829";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) Use 4 digits (b) PIN saved
19. 19.🔀 What does this PIN rule show?
    let pin = "86605";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) PIN saved (b) Use 4 digits
20. 20.🔀 What does >= mean? (a) greater than or equal (b) smaller or equal (c) less than (d) not equal
21. 21.🔀 Which badge does this quiz app show?
    let marks = 24;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    } (a) Silver (b) Gold (c) Bronze
22. 22.🔀 What number does this shop app show?
    let total = 610;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
23. 23.🔀 What number does this shop app show?
    let total = 290;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
24. 24.🔀 What number does this shop app show?
    let total = 680;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
25. 25.🔀 What number does this shop app show?
    let total = 870;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
26. 26.🔀 What number does this shop app show?
    let total = 400;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
27. 27.🔀 What does this sign-up rule show?
    let age = 10;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Welcome! (b) Ask a parent
28. 28.🔀 What number does this shop app show?
    let total = 370;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
29. 29.🔀 Which badge does this quiz app show?
    let marks = 89;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    } (a) Gold (b) Silver (c) Bronze
30. 30.🔀 What number does this shop app show?
    let total = 770;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
31. 31.🔀 Which badge does this quiz app show?
    let marks = 94;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    } (a) Bronze (b) Silver (c) Gold
32. 32.🔀 What does this PIN rule show?
    let pin = "3224";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) Use 4 digits (b) PIN saved
33. 33.🔀 What does this PIN rule show?
    let pin = "1278";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) PIN saved (b) Use 4 digits
34. 34.🔀 Which badge does this quiz app show?
    let marks = 65;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    } (a) Gold (b) Silver (c) Bronze
35. 35.🔀 What does this PIN rule show?
    let pin = "26126";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) PIN saved (b) Use 4 digits
36. 36.🔀 What number does this shop app show?
    let total = 280;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
37. 37.🔀 What does this sign-up rule show?
    let age = 9;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Welcome! (b) Ask a parent
38. 38.🔀 What does this battery rule show?
    let battery = 40;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Battery OK (b) Low battery
39. 39.🔀 What does this battery rule show?
    let battery = 83;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Battery OK (b) Low battery
40. 40.🔀 Which badge does this quiz app show?
    let marks = 49;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    } (a) Silver (b) Bronze (c) Gold

Free app development lessons, practice and worksheets at talentjr.in/app-development-for-students