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multiplyStrings.cpp
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multiplyStrings.cpp
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// Source : https://oj.leetcode.com/problems/multiply-strings/
// Author : Hao Chen
// Date : 2014-07-18
/**********************************************************************************
*
* Given two numbers represented as strings, return multiplication of the numbers as a string.
*
* Note: The numbers can be arbitrarily large and are non-negative.
*
**********************************************************************************/
#include <iostream>
#include <string>
using namespace std;
string multiply(string& num, char ch){
int n = ch - '0';
string s;
int carry = 0;
int x;
for(int i=num.size()-1; i>=0; i--){
x = (num[i]-'0') * n + carry;
carry = x/10;
s.insert(s.begin(), x%10+'0');
}
if (carry>0) {
s.insert(s.begin(), carry+'0');
}