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strconv: new decimal digits counts function (#10029)

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penguindark 2021-05-07 23:24:50 +02:00 committed by GitHub
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commit e9d7ff751f
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79
vlib/strconv/utilities.v
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@ -347,3 +347,82 @@ pub fn f64_to_str_l(f f64) string {
res[r_i] = 0
return unsafe { tos(res.data,r_i) }
}
// dec_digits return the number of decimal digit of an u64
pub fn dec_digits(n u64) int {
if n <= 9_999_999_999 { // 1-10
if n <= 99_999 { // 5
if n <= 99 { // 2
if n <= 9 { // 1
return 1
} else {
return 2
}
} else {
if n <= 999 { // 3
return 3
} else {
if n <= 9999 { // 4
return 4
} else {
return 5
}
}
}
} else {
if n <= 9_999_999 { // 7
if n <= 999_999 { // 6
return 6
} else {
return 7
}
} else {
if n <= 99_999_999 { //8
return 8
} else {
if n <= 999_999_999 { // 9
return 9
}
return 10
}
}
}
} else {
if n <= 999_999_999_999_999 { // 5
if n <= 999_999_999_999 { // 2
if n <= 99_999_999_999 { // 1
return 11
} else {
return 12
}
} else {
if n <= 9_999_999_999_999 { // 3
return 13
} else {
if n <= 99_999_999_999_999 { // 4
return 14
} else {
return 15
}
}
}
} else {
if n <= 99_999_999_999_999_999 { // 7
if n <= 9_999_999_999_999_999 { // 6
return 16
} else {
return 17
}
} else {
if n <= 999_999_999_999_999_999 { //8
return 18
} else {
if n <= 9_999_999_999_999_999_999 { // 9
return 19
}
return 20
}
}
}
}
}