mirror of
https://github.com/vlang/v.git
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39429f7ac9
* removed sprintf for f64 and f32 use * removed all pointers from the code, used unions instead * solved module name problem * fixed tests on vlib/math * fix for alpine-linux math test * small fix on byte allocation for ftoa
79 lines
1.4 KiB
V
79 lines
1.4 KiB
V
/**********************************************************************
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*
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* String to float Test
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*
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**********************************************************************/
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import (
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strconv
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strconv.atofq
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)
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fn test_atof() {
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//
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// test set
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//
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// float64
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src_num := [
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f64(0.3),
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-0.3,
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0.004,
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-0.004,
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0.0,
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-0.0,
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31234567890123
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]
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// strings
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src_num_str := [
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'0.3',
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'-0.3',
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'0.004',
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'-0.004',
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'0.0',
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'-0.0',
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'31234567890123',
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]
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// check conversion case 1 string <=> string
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for c,x in src_num {
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// slow atof
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assert strconv.atof64(src_num_str[c]).strlong() == x.strlong()
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// quick atof
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mut s1 := (atofq.atof_quick(src_num_str[c]).str())
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mut s2 := (x.str())
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delta := s1.f64() - s2.f64()
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//println("$s1 $s2 $delta")
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assert delta < f64(1e-16)
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// test C.atof
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n1 := x.strsci(18)
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n2 := f64(C.atof(src_num_str[c].str)).strsci(18)
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//println("$n1 $n2")
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assert n1 == n2
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}
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// check conversion case 2 string <==> f64
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// we don't test atof_quick beacuse we already know the rounding error
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for c,x in src_num_str {
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b := src_num[c].strlong()
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a1 := strconv.atof64(x).strlong()
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assert a1 == b
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}
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// special cases
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mut f1 := f64(0.0)
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mut ptr := *u64(&f1)
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ptr = *u64(&f1)
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// DOUBLE_PLUS_ZERO
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f1=0.0
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assert *ptr == u64(0x0000000000000000)
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// DOUBLE_MINUS_ZERO
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f1=-0.0
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assert *ptr == u64(0x8000000000000000)
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//println("DONE!")
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}
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