173 lines
3.0 KiB
V
173 lines
3.0 KiB
V
import strconv
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/**********************************************************************
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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 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.,
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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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for exp := 1 ; 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 + 1
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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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