基于这个问题:有没有办法将数字四舍五入成友好的格式?
挑战 -更新! (从规范中删除了数百个缩写)
按字符数计算的最短代码,它将缩写一个整数(无小数)。
代码应包括完整的程序。
相关范围是从0 - 9,223,372,036,854,775,807
(有符号 64 位整数的上限)。
缩写的小数位数将为正数。您不需要计算以下内容:(920535 abbreviated -1 place
类似于0.920535M
)。
十位和百位 ( 0-999
)中的数字绝不应缩写(数字57
到1+
小数位的缩写是5.7dk
- 不必要且不友好)。
请记住从零取整一半(23.5 取整为 24)。银行家的四舍五入是禁止的。
以下是相关的数字缩写:
h = hundred (10
2
)
k = thousand (10
3
)
M = million (10
6
)
G = billion (10
9
)
T = trillion (10
12
)
P = quadrillion (10
15
)
E = quintillion (10
18
)
示例输入/输出(输入可以作为单独的参数传递):
第一个参数将是要缩写的整数。第二个是小数位数。
12 1 => 12 // tens and hundreds places are never rounded
1500 2 => 1.5k
1500 0 => 2k // look, ma! I round UP at .5
0 2 => 0
1234 0 => 1k
34567 2 => 34.57k
918395 1 => 918.4k
2134124 2 => 2.13M
47475782130 2 => 47.48G
9223372036854775807 3 => 9.223E
// ect...
相关问题的原始答案(JavaScript,不遵循规范):
function abbrNum(number, decPlaces) {
// 2 decimal places => 100, 3 => 1000, etc
decPlaces = Math.pow(10,decPlaces);
// Enumerate number abbreviations
var abbrev = [ "k", "m", "b", "t" ];
// Go through the array backwards, so we do the largest first
for (var i=abbrev.length-1; i>=0; i--) {
// Convert array index to "1000", "1000000", etc
var size = Math.pow(10,(i+1)*3);
// If the number is bigger or equal do the abbreviation
if(size <= number) {
// Here, we multiply by decPlaces, round, and then divide by decPlaces.
// This gives us nice rounding to a particular decimal place.
number = Math.round(number*decPlaces/size)/decPlaces;
// Add the letter for the abbreviation
number += abbrev[i];
// We are done... stop
break;
}
}
return number;
}