回答編集履歴
2
おまけ
test
CHANGED
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@@ -7,3 +7,27 @@
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7
7
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return "%,d".format(value.toLong())
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8
8
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9
9
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```
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10
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+
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11
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12
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13
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+
# おまけ
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14
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15
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16
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17
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+
```kotlin
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18
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19
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fun Int.toStringWithSeparator() = this.toString().reversed().withIndex().map {it.value + if ((it.index-1) % 3 == 2) "," else ""}.reversed().joinToString(separator = "")
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20
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+
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21
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22
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23
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println(1234567890.toStringWithSeparator())
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24
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25
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//=> 1,234,567,890
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26
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27
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```
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28
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29
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30
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31
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+
負値には対応していませんｗ
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32
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33
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+
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1
3
test
CHANGED
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@@ -4,6 +4,6 @@
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4
4
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5
5
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```kotlin
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6
6
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7
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-
return "%,
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7
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+
return "%,d".format(value.toLong())
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8
8
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9
9
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```
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