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feat: 两个大数相加 #253

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29 changes: 27 additions & 2 deletions lib/add.js
Original file line number Diff line number Diff line change
@@ -1,5 +1,30 @@
function add() {
// 实现该函数
function add(a, b) {
// 实现该函数
if (typeof a === 'number') a = String(a)
if (typeof b === 'number') b = String(b)

//取两个数字的最大长度
const maxLength = Math.max(a.length, b.length)

//用0去补齐长度
a = a.padStart(maxLength, 0)
b = b.padStart(maxLength, 0)

let temp = 0
// 进位的标志
let carry = 0
let sum = ''

for(let i = maxLength - 1; i >=0; i--) {
temp = parseInt(a[i]) + parseInt(b[i]) + carry
carry = Math.floor(temp / 10)
sum = temp % 10 + sum
}

if (carry === 1) {
sum = '1' + sum
}
return sum
}

module.exports = add