Exercises 3.3

1. integer

2. real

3. real

4. neither – quotes denote string literal

5. neither – this is an expression, not a literal

6. real

7. neither – minus may not follow literal

8. neither – commas not allowed

9. integer

10. neither – dollar sign not allowed

11. real

12. real

13. neither – missing mantissa

14. neither – variable name

15. neither – exponent must be an integer

16. real

17. neither – this is an expression, not a literal

18. neither – this is an expression, not a literal

19. real

20. neither – this is an expression, not a literal

21. 1 22. 0

23. 0.9 24. 0

25. 0.5 26. 1

27. 2 28. 2

29. 1 30. 2

31. 12 32. 12.5

33. 0 34. –15.0

35. –15.0 36. 18

37. 3 38. 1

39. 3 40. 1001

41. 1101 42. 0100

43. 0011 = 3 44. 110100 = 52

45. 4.0 46. invalid -- Math.sqrt(-4.0) is undefined

47. 4.0 48. 1

49. 2 50. 1

51. 1 52. 7.0

53. 8.0 54. 2

55. 2.66666 . . . 56. 20.0

57. 5.1 58. 4.0

59. 6.25 60. 3.0

61. 10 + 5 * B - 4 * A * C

62. 3 * (4 - n)) / (2 * (m * m + n * n))

63. Math.sqrt(a + 3 * b * b)

64. Math.sqrt((m + n) / 2)

65. Math.abs(A / (m + n))

66. Math.exp(x * Math.log(a))

67. (int)(cost * 100.0 + 0.5) / 100.0

68. (a) (int)(12.342 * 100.0 + 0.5) / 100.0

= (int)(1234.7)) / 100.0 = 1234.0 / 100.0 = 12.34

(b) (int)(12.348 * 100.0 + 0.5) / 100.0

= (int)(1235.3)) / 100.0 = 1235.0 / 100.0 = 12.35

(c) (int)(12.345 * 100.0 + 0.5) / 100.0

= (int)(1235.0)) / 100.0 = 1235.0 / 100.0 = 12.35

(d) (int)(12.340 * 100.0 + 0.5) / 100.0

= (int)(1234.5)) / 100.0 = 1234.0 / 100.0 = 12.34

(e) (int)(13.0 * 100.0 + 0.5) / 100.0

= (int)(1300.5) / 100.0 = 1300.0 / 100.0 = 13.0

69. x = (int)(x * 10.0 + 0.5) / 10.0;

70. x = (int)(x * 1000.0 + 0.5) / 1000.0;