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实现大数相加 #261

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实现大数相加 #261

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feat: 完成test
zhudui Aug 21, 2022
9f631b9
Merge branch 'master' of https://github.com/zhudui/exercise2
zhudui Aug 21, 2022
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17 changes: 15 additions & 2 deletions lib/add.js
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Original file line number Diff line number Diff line change
@@ -1,5 +1,18 @@
function add() {
// 实现该函数
function add(a, b) {
const maxLength = Math.max(a.length, b.length);
const num1 = a.padStart(maxLength, '0');
const num2 = b.padStart(maxLength, '0');
let res = '';
let carry = 0;
for (let i = num1.length - 1; i >= 0; --i) {
const count = parseInt(num1[i]) + parseInt(num2[i]) + carry;
carry = Math.floor(count / 10);
res = count % 10 + res;
}
if (carry) {
res = '1' + res;
}
return res;
}

module.exports = add