C # Big Data calculator-Subtraction

Class bigreduce: bigcalculate
 

{

Public override string evaluate (string num1, string num2)

{

Bool isminus = false;

// Determine whether the calculation result is a positive number (that is, whether num1 is greater than num2). If it is equal, 0 is directly returned.

// If the result is negative, replace num1 and num2 and add '-' before the return value '-'

If (num1.equals (num2 ))

{

Return "0 ";

}

Else if (max (num1, num2). Equals (num2) // if the expected calculation result is negative, set num1
Num2 exchange

{

Changenum (ref num1, ref num2 );

Isminus = true;

}

# Region myregion

// Obtain a large number of digits

Int Len = num1.length> num2.length? Num1.length:
Num2.length;

// Add the decimal difference to 0

String tempnum1 = new string ('0', len-num1.length) + num1;

String tempnum2 = new string ('0', len-num2.length) + num2;

Int flag = 0; // carry character

List Lich = new list (); // stores the calculated number

For (INT I = len-1; I> = 0; I --)

{

If (tempnum1 [I]> = tempnum2 [I] + flag)

{

Lich. Add (char) (tempnum1 [I]-tempnum2 [I]-flag + '0 '));

Flag = 0;

}

Else

{

Lich. Add (char) (tempnum1 [I]-tempnum2 [I]-flag + 10 +
'0 '));

Flag = 1;

}

}

// If the result is 0 in the upper order, remove it.

// If the result is negative, the returned result is added "-"

If (isminus = true)

{

Return "-" + invertorder (New
String (lich. toarray (). trimstart ('0 ');

}

Return invertorder (New
String (lich. toarray (). trimstart ('0 ');

# Endregion

}
}