KattisQns/SimpleAddition.cpp at master · MuhammadHoze/KattisQns · GitHub

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#include <bits/stdc++.h>

using namespace std;


int add(char n1, char n2) {
    return (n1 - '0' ) + (n2 - '0');
}

int main(void){


//	long long num1;
//	long long num2;
//	long long sum;
//
//	cin >> num1;
//	cin >> num2;
//
//	sum = num1 + num2;
//
//	cout << sum << endl;


	string num1;
	string num2;
	string sum;

	int len1,len2;
	int carry = 0 , temp;

	cin >> num1;
	cin >> num2;

	len1 = num1.length() - 1;
	len2 = num2. length() - 1;


	for(; len1>=0 || len2>=0; len1--, len2--){
        if(len2 < 0) {
            temp = add(num1[len1], '0');
        }
		else if (len1 < 0) {
            temp = add(num2[len2], '0');
        }
		else {
            temp = add(num1[len1], num2[len2]);
        }
		temp += carry;
		if(temp > 9){

			carry = 1;
			temp -=10;
		}
		else{

			carry = 0;
		}
		sum.insert(0,to_string(temp));

	}
	if(carry == 1){

		sum.insert(0,to_string(1));
	}
	cout << sum <<endl;

	return 0;
}