Integer addition

Please design an algorithm that can add two integers stored in strings and return error for illegal input

Enter description:

The input is a line containing two strings, the length of which is in [1,100].

Output description:

The output is one line. The addition result is output in legal cases, and error in illegal cases.

Example 1

enter

123 123
abd 123

output

246
Error

python implementation:

import sys
for i in sys.stdin.readlines():
    try:
        print(sum(map(int,i.strip().split(' '))))
    except:
        print("error")

C++ implementation:

#include <iostream>
#include "string"
using namespace std;

intmain()
{
	string s1, s2;
	bool f1 = false	, f2 = false;
	int sum
	char t1[100], t2[100];


	while(cin >> s1 >> s2)
	{
		for(int i = 0; i < s1.size(); i ++)
		{
			t1[i] = s1[i];
			if(s1[i] >= '0' && s1[i] <= '9')
			{
				f1 = true;
				continue;
			}
			else
			{
				f1 = false;
				cout << "error" << endl;
				break;
			}
		}

		for(int i = 0; i < s2.size(); i ++)
		{
			t2[i] = s2[i];
			if(s2[i] >= '0' && s2[i] <= '9')
			{
				f2 = true;
				continue;
			}
			else
			{
				cout << "Error" << endl;
				break;
			}
		}

		if(f1 && f2)
		{
			sum = atoi (t1) + atoi (t2);
			cout << sum << endl;
		}

	}

	return 0;
}