Adding two very large numbers using char arrays
Hello there,
I wrote a program trying to add two very large numbers using char arrays and int arrays.
but I have a problem, I tried adding the number "99999999999999999999999999999999999999999999999999999999999999" and "1"
the result was "0000000000000000000000000000000000000000"
The program works on any other number than 9s. I don't know why.
Can you guys help me please? Thank you.
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#include <iostream>
#include <string>
#include <stdlib.h>
using namespace std;
class Addition
{
private:
//255 because CHAR_MAX is 255, CHAR_MIN is 0.
//Because we have CHAR_MAX 255, int will also be 255.
int Number1[255], Number2[255], sum[255];
char String1[255], String2[255];
//Length1=length of N1, Length2=length of N2.
int Length1, Length2;
public:
Addition(){};
void __ADDITION();
};
void Addition::__ADDITION()
{
scanf("%s", &String1);
scanf("%s", &String2);
/* convert character to integer*/
for (Length1 = 0; String1[Length1] != '\0'; Length1++)
{
Number1[Length1] = String1[Length1] - '0';
}
for (Length2 = 0; String2[Length2] != '\0'; Length2++)
{
Number2[Length2] = String2[Length2] - '0';
}
if(String1 <= 0)
{
cout << "Invalid input" << endl;
}
int carry = 0;
int k = 0;
int i = Length1 - 1;
int j = Length2 - 1;
for (; i >= 0 && j >= 0; i--, j--, k++)
{
sum[k] = (Number1[i] + Number2[j] + carry) % 10;
carry = (Number1[i] + Number2[j] + carry) / 10;
}
if (Length1 > Length2)
{
while (i >= 0) {
sum[k++] = (Number1[i] + carry) % 10;
carry = (Number1[i--] + carry) / 10;
}
}
else if (Length1 < Length2)
{
while (j >= 0) {
sum[k++] = (Number2[j] + carry) % 10;
carry = (Number2[j--] + carry) / 10;
}
}
else
{
if (carry > 0)
sum[k++] = carry;
}
cout << "SUM = ";
for (k--; k >= 0; k--)
{
cout << sum[k];
}
}
int main()
{
cout << endl;
cout << "Hello, this program calculates two large numbers using ASCII and Arrays." << endl;
cout << "We can convert Char or String into Int using ASCII and specifically by " << endl
<< "subtracting '0' or 48.";
cout << endl;
cout << endl;
Addition instance1;
instance1.__ADDITION();
system("PAUSE");
return 0;
}
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