| 1 | ## oils_failures_allowed: 0
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| 2 |
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| 3 | #### Float Literals with e-1
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| 4 |
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| 5 | shopt -s ysh:upgrade
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| 6 | # 1+2 2.3
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| 7 | var x = 1.2 + 23.0e-1 # 3.5
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| 8 | if (3.4 < x and x < 3.6) {
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| 9 | echo ok
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| 10 | }
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| 11 | ## STDOUT:
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| 12 | ok
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| 13 | ## END
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| 14 |
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| 15 | #### Float Literal with _
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| 16 |
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| 17 | shopt -s ysh:upgrade
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| 18 |
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| 19 | # 1+2 + 2.3
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| 20 | # add this _ here
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| 21 | var x = 1.2 + 2_3.0e-1 # 3.5
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| 22 | if (3.4 < x and x < 3.6) {
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| 23 | echo ok
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| 24 | }
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| 25 |
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| 26 | ## STDOUT:
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| 27 | ok
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| 28 | ## END
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| 29 |
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| 30 |
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| 31 | #### Period requires digit on either side, not 5. or .5
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| 32 | echo $[0.5]
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| 33 | echo $[5.0]
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| 34 | echo $[5.]
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| 35 | echo $[.5]
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| 36 |
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| 37 | ## status: 2
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| 38 | ## STDOUT:
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| 39 | 0.5
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| 40 | 5.0
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| 41 | ## END
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| 42 |
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| 43 | #### Big float Literals with _
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| 44 |
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| 45 | # C++ issue: we currently print with snprintf %g
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| 46 | # Pars
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| 47 |
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| 48 | echo $[42_000.000_500]
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| 49 |
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| 50 | echo $[42_000.000_500e1]
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| 51 | echo $[42_000.000_500e-1]
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| 52 |
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| 53 | ## STDOUT:
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| 54 | 42000.0005
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| 55 | 420000.005
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| 56 | 4200.00005
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| 57 | ## END
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| 58 |
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| 59 | #### Big floats like 1e309 and -1e309 go to Inf / -Inf
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| 60 |
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| 61 | # Notes
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| 62 | # - Python float() and JS parseFloat() agree with this behavior
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| 63 | # - JSON doesn't have inf / -inf
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| 64 |
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| 65 | echo $[1e309]
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| 66 | echo $[-1e309]
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| 67 |
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| 68 | ## STDOUT:
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| 69 | inf
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| 70 | -inf
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| 71 | ## END
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| 72 |
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| 73 | #### Tiny floats go to zero
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| 74 |
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| 75 | shopt -s ysh:upgrade
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| 76 | # TODO: need equivalent of in YSh
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| 77 | # '0' * 309
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| 78 | # ['0'] * 309
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| 79 |
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| 80 | # 1e-324 == 0.0 in Python
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| 81 |
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| 82 | var zeros = []
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| 83 | for i in (1 .. 324) {
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| 84 | call zeros->append('0')
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| 85 | }
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| 86 |
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| 87 | #= zeros
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| 88 |
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| 89 | var s = "0.$[join(zeros)]1"
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| 90 | #echo $s
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| 91 |
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| 92 | echo float=$[float(s)]
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| 93 |
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| 94 | ## STDOUT:
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| 95 | float=0.0
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| 96 | ## END
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| 97 |
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| 98 |
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| 99 | #### floatEquals() INFINITY NAN
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| 100 |
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| 101 | shopt --set ysh:upgrade
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| 102 | source $LIB_YSH/list.ysh
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| 103 |
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| 104 | # Create inf
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| 105 | var big = repeat('12345678', 100) ++ '.0'
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| 106 |
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| 107 | var inf = fromJson(big)
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| 108 | var neg_inf = fromJson('-' ++ big)
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| 109 |
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| 110 | if (floatsEqual(inf, INFINITY)) {
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| 111 | echo inf
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| 112 | }
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| 113 |
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| 114 | if (floatsEqual(neg_inf, -INFINITY)) {
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| 115 | echo neg_inf
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| 116 | }
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| 117 |
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| 118 | if (floatsEqual(NAN, INFINITY)) {
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| 119 | echo bad
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| 120 | }
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| 121 |
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| 122 | if (floatsEqual(NAN, NAN)) {
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| 123 | echo bad
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| 124 | }
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| 125 |
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| 126 | if (not floatsEqual(NAN, NAN)) {
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| 127 | echo 'nan is not nan'
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| 128 | }
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| 129 |
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| 130 | ## STDOUT:
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| 131 | inf
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| 132 | neg_inf
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| 133 | nan is not nan
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| 134 | ## END
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| 135 |
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| 136 | #### Regression: 1/3 gives 0.3+
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| 137 |
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| 138 | # We were using float precision, not double
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| 139 |
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| 140 | shopt --set ysh:upgrade
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| 141 |
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| 142 | pp line (1/3) | read --all
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| 143 | if (_reply ~ / '0.' '3'+ / ) {
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| 144 | echo one-third
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| 145 | }
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| 146 |
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| 147 | pp line (2/3) | read --all
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| 148 | if (_reply ~ / '0.' '6'+ '7' / ) {
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| 149 | echo two-thirds
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| 150 | }
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| 151 |
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| 152 | ## STDOUT:
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| 153 | one-third
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| 154 | two-thirds
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| 155 | ## END
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| 156 |
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| 157 | #### Number of digits in 1/3
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| 158 | shopt --set ysh:upgrade
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| 159 |
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| 160 | # - Python 2 and bin/ysh: 14
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| 161 | # - Python 3: 18
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| 162 | # - YSH C++: 19 - see mycpp/float_test.cc, tip from Bruce Dawson
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| 163 |
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| 164 | var s = str(1/3)
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| 165 | #echo "ysh len $[len(s)]"
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| 166 | #echo ysh=$s
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| 167 |
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| 168 | # Don't bother to distinguish OSH Python vs C++ here
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| 169 | case (len(s)) {
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| 170 | (14) { echo pass }
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| 171 | (19) { echo pass }
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| 172 | (else) { echo FAIL }
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| 173 | }
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| 174 |
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| 175 | exit
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| 176 |
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| 177 | var py2 = $(python2 -c 'print(1.0/3)')
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| 178 | echo "py2 len $[len(py2)]"
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| 179 | echo py2=$py2
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| 180 |
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| 181 | var py3 = $(python3 -c 'print(1/3)')
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| 182 | echo "py3 len $[len(py3)]"
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| 183 | echo py3=$py3
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| 184 |
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| 185 | ## STDOUT:
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| 186 | pass
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| 187 | ## END
|