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175 lines
3.2 KiB
V
175 lines
3.2 KiB
V
/**********************************************************************
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*
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* Float to string Test
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*
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**********************************************************************/
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import strconv
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import math
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union Ufloat32 {
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mut:
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f f32 = f32(0)
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b u32
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}
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union Ufloat64 {
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mut:
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f f64 = f64(0)
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b u64
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}
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fn f64_from_bits1(b u64) f64 {
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mut x := Ufloat64{}
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x.b = b
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// C.printf("bin: %016llx\n",x.f)
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return unsafe { x.f }
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}
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fn f32_from_bits1(b u32) f32 {
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mut x := Ufloat32{}
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x.b = b
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// C.printf("bin: %08x\n",x.f)
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return unsafe { x.f }
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}
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fn test_float_to_str() {
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test_cases_f32 := [
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f32_from_bits1(0x0000_0000), // +0
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f32_from_bits1(0x8000_0000), // -0
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f32_from_bits1(0xFFC0_0001), // sNan
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f32_from_bits1(0xFF80_0001), // qNan
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f32_from_bits1(0x7F80_0000), // +inf
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f32_from_bits1(0xFF80_0000), // -inf
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1,
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-1,
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10,
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-10,
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0.3,
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-0.3,
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1000000,
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123456.7,
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123e35,
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-123.45,
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1e23,
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f32_from_bits1(0x0080_0000), // smallest float32
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math.max_f32,
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383260575764816448.0,
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]
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exp_result_f32 := [
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'0e+00',
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'-0e+00',
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'nan',
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'nan',
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'+inf',
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'-inf',
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'1.e+00',
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'-1.e+00',
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'1.e+01',
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'-1.e+01',
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'3.e-01',
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'-3.e-01',
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'1.e+06',
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'1.234567e+05',
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'1.23e+37',
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'-1.2345e+02',
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'1.e+23',
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'1.1754944e-38', // aprox from 1.1754943508 × 10−38,
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'3.4028235e+38',
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'3.8326058e+17',
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]
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test_cases_f64 := [
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f64_from_bits1(0x0000_0000_0000_0000), // +0
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f64_from_bits1(0x8000_0000_0000_0000), // -0
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f64_from_bits1(0x7FF0_0000_0000_0001), // sNan
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f64_from_bits1(0x7FF8_0000_0000_0001), // qNan
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f64_from_bits1(0x7FF0_0000_0000_0000), // +inf
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f64_from_bits1(0xFFF0_0000_0000_0000), // -inf
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1,
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-1,
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10,
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-10,
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0.3,
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-0.3,
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1000000,
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123456.7,
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123e45,
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-123.45,
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1e23,
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f64_from_bits1(0x0010_0000_0000_0000), // smallest float64
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math.max_f32,
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383260575764816448,
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383260575764816448,
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// C failing cases
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123e300,
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123e-300,
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5.e-324,
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-5.e-324,
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]
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exp_result_f64 := [
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'0e+00',
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'-0e+00',
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'nan',
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'nan',
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'+inf',
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'-inf',
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'1.e+00',
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'-1.e+00',
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'1.e+01',
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'-1.e+01',
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'3.e-01',
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'-3.e-01',
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'1.e+06',
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'1.234567e+05',
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'1.23e+47',
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'-1.2345e+02',
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'1.e+23',
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'2.2250738585072014e-308',
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'3.4028234663852886e+38',
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'3.8326057576481645e+17',
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'3.8326057576481645e+17',
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'1.23e+302', // this test is failed from C sprintf!!
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'1.23e-298',
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'5.e-324',
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'-5.e-324',
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]
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// test f32
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for c, x in test_cases_f32 {
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// println(x)
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s := strconv.f32_to_str(x, 8)
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s1 := exp_result_f32[c]
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// println("$s1 $s")
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assert s == s1
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}
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// test f64
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for c, x in test_cases_f64 {
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s := strconv.f64_to_str(x, 17)
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s1 := exp_result_f64[c]
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// println("$s1 $s")
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assert s == s1
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}
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// test long format
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assert strconv.f64_to_str_l('1e1'.f64()).len == 4 // '10.0'
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assert strconv.f64_to_str_l('1e-1'.f64()).len == 3 // '0.1'
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for exp := 2; exp < 120; exp++ {
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a := strconv.f64_to_str_l(('1e' + exp.str()).f64())
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// println(a)
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assert a.len == exp + 3
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b := strconv.f64_to_str_l(('1e-' + exp.str()).f64())
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// println(b)
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assert b.len == exp + 2
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}
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// test rounding str conversion
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// println( ftoa.f64_to_str(0.3456789123456, 4) )
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// assert ftoa.f64_to_str(0.3456789123456, 4)=="3.4568e-01"
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// assert ftoa.f32_to_str(0.345678, 3)=="3.457e-01"
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}
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