-
Notifications
You must be signed in to change notification settings - Fork 64
/
字符串相加.js
45 lines (43 loc) · 865 Bytes
/
字符串相加.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
/**
* @param {string} num1
* @param {string} num2
* @return {string}
415.字符串相加
*/
var addStrings = function(num1, num2) {
let len1 = num1.length
let len2 = num2.length
let i = len1 - 1
let j = len2 - 1
let carry = 0
let ans = ''
while(i>=0 || j>=0) {
let cur1 = i < 0 ? 0 : num1[i] * 1
let cur2 = j < 0 ? 0 : num2[j] * 1
let {result, nextcarry} = add (cur1, cur2, carry)
carry = nextcarry
ans = result + ans
i--
j--
}
if(carry!==0) {
ans = carry + ans
}
return ans
};
function add(n1, n2, lastCarry) {
let result = 0
let nextcarry = 0
let num = n1 + n2 + lastCarry
if(num >= 10) {
let strnum = String(num)
result = strnum.slice(1) * 1
nextcarry = strnum.slice(0,1) * 1
} else {
result = num
}
return {
result,
nextcarry
}
}