Python-Programs/Sum_very_large_numbers at master · bossdarshit/Python-Programs · GitHub

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def findSum(str1, str2):

    if (len(str1) > len(str2)):
        t = str1;
        str1 = str2;
        str2 = t;


    str = "";

    n1 = len(str1);
    n2 = len(str2);

    # Reverse both of strings
    str1 = str1[::-1];
    str2 = str2[::-1];

    carry = 0;
    for i in range(n1):


        sum = ((ord(str1[i]) - 48) +
              ((ord(str2[i]) - 48) + carry));
        str += chr(sum % 10 + 48);


        carry = int(sum / 10);


    for i in range(n1, n2):
        sum = ((ord(str2[i]) - 48) + carry);
        str += chr(sum % 10 + 48);
        carry = (int)(sum / 10);


    if (carry):
        str += chr(carry + 48);


    str = str[::-1];

    return str;


str1 = "12";
str2 = "198111";
print(findSum(str1, str2));