43. Multiply Strings
Given two non-negative integers num1 and num2 represented as strings, return the product of num1 and num2, also represented as a string.
Example 1:
Input: num1 = "2", num2 = "3"Output: "6"
Example 2:
Input: num1 = "123", num2 = "456"Output: "56088"
题意：实现‘乘’运算符
代码如下：
/** * @param {string} num1 * @param {string} num2 * @return {string} */var multiply = function(num1, num2) { ???????let m=num1.length,n=num2.length; ???????let pos=new Array(m+n).fill(0); ???????for(let i=m-1;i>=0;i--){ ???????????for(let j=n-1;j>=0;j--){ ???????????????let mul=parseInt(num1.charAt(i))*parseInt(num2.charAt(j)); ???????????????let p1=i+j,p2=i+j+1; ???????????????let sum=mul+pos[p2]; ???????????????????????????????pos[p1]+=parseInt(sum/10); ???????????????pos[p2]=sum%10; ???????????} ???????} ???????let sb=‘‘; ???????for(let p of pos){ ???????????if(!(p==0 && sb.length==0)) sb+=p; ???????????????????} ???????return sb.length==0?"0":sb;};43. Multiply Strings（js）
原文地址：https://www.cnblogs.com/xingguozhiming/p/10424924.html