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add_strings.cpp
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add_strings.cpp
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/*
* =====================================================================================
*
* Filename: add_strings.cpp
*
* Description: Add Strings. Given two non-negative integers num1 and num2
* represented as string, return the sum of num1 and num2.
*
* Version: 1.0
* Created: 02/20/19 01:59:25
* Revision: none
* Compiler: gcc
*
* Author: Zhu Xianfeng (), [email protected]
* Organization:
*
* =====================================================================================
*/
#include <stdio.h>
#include <string>
class Solution
{
public:
std::string addStrings(const std::string& num1, const std::string& num2)
{
std::string sum;
auto iter1 = num1.rbegin();
auto iter2 = num2.rbegin();
int exceed = 0;
while (iter1 != num1.rend() || iter2 != num2.rend())
{
int val = exceed;
if (iter1 != num1.rend())
{
val += *iter1 - '0';
iter1++;
}
if (iter2 != num2.rend())
{
val += *iter2 - '0';
iter2++;
}
if (val > 9)
{
exceed = val / 10;
val %= 10;
}
else
{
exceed = 0;
}
sum.insert(0, 1, val + '0');
}
if (exceed > 0)
{
sum.insert(0, 1, exceed + '0');
}
return sum;
}
};
int main(int argc, char* argv[])
{
std::string num1 = "123";
std::string num2 = "456";
if (argc >= 3)
{
num1 = argv[1];
num2 = argv[2];
}
auto num = Solution().addStrings(num1, num2);
printf("%s + %s = %s\n", num1.c_str(), num2.c_str(), num.c_str());
return 0;
}