Random .000000000X's

[SheepCow]

Alright so this program is suppose to make a chart converting Celsius to Farenheit, what I dont understand is why there are .000000X's after some of the numbers, any ideas?

public class CelsiusFarenheitCalculator
{
public static void main(String[] args)
{
int C; //Celsius Value
int aF; //Approximate Farenheit Value
double F; //Farenheit Value

System.out.print("Celsius\t Farenheit\t Approximate Farenheit");
for(C=0;C<=100;C++)
{
aF = 2*C + 32;
F = 1.8*C +32;
System.out.println("\n "+C+"\t\t"+F+"\t\t "+aF);
}
}

OUTPUT

Celsius Farenheit Approximate Farenheit
0 32.0 32

1 33.8 34

2 35.6 36

3 37.4 38

4 39.2 40

5 41.0 42

6 42.8 44

7 44.6 46

8 46.4 48

9 48.2 50

10 50.0 52

11 51.8 54

12 53.6 56

13 55.400000000000006 58

14 57.2 60

15 59.0 62

16 60.8 64

17 62.6 66

18 64.4 68

19 66.2 70

20 68.0 72

21 69.80000000000001 74

22 71.6 76

23 73.4 78

24 75.2 80

25 77.0 82

26 78.80000000000001 84

27 80.6 86

28 82.4 88

29 84.2 90

30 86.0 92

31 87.80000000000001 94

32 89.6 96

33 91.4 98

34 93.2 100

35 95.0 102

36 96.8 104

37 98.60000000000001 106

38 100.4 108

39 102.2 110

40 104.0 112

41 105.8 114

42 107.60000000000001 116

43 109.4 118

44 111.2 120

45 113.0 122

46 114.8 124

47 116.60000000000001 126

48 118.4 128

49 120.2 130

50 122.0 132

51 123.8 134

52 125.60000000000001 136

53 127.4 138

54 129.2 140

55 131.0 142

56 132.8 144

57 134.60000000000002 146

58 136.4 148

59 138.2 150

60 140.0 152

61 141.8 154

62 143.60000000000002 156

63 145.4 158

64 147.2 160

65 149.0 162

66 150.8 164

67 152.60000000000002 166

68 154.4 168

69 156.2 170

70 158.0 172

71 159.8 174

72 161.6 176

73 163.4 178

74 165.20000000000002 180

75 167.0 182

76 168.8 184

77 170.6 186

78 172.4 188

79 174.20000000000002 190

80 176.0 192

81 177.8 194

82 179.6 196

83 181.4 198

84 183.20000000000002 200

85 185.0 202

86 186.8 204

87 188.6 206

88 190.4 208

89 192.20000000000002 210

90 194.0 212

91 195.8 214

92 197.6 216

93 199.4 218

94 201.20000000000002 220

95 203.0 222

96 204.8 224

97 206.6 226

98 208.4 228

99 210.20000000000002 230

100 212.0 232

[Fubarable]

Please read this: What every Computer Scientist Should Know about Floating Point Numbers

The solution is to format the number String prior to displaying it, and to do this, you can use String.format(...) or DecimalFormat, or System.out.printf(...), your choice.