public static string CalculateSubtract(string screen)
{
active = false; //resets active to false
int spot; //spot of sign
for (spot = 0; spot < screen.Length; spot++)
{
if (screen[spot] == '-' && spot > 0) //if spot == 0 and result = - then issue
{
if (screen[spot - 1] != '*' && screen[spot - 1] != '/' && screen[spot - 1] != '+' && screen[spot - 1] != '-')
{
active = true;
break;
}
}
}
if (active == true)
{
string num1 = screen.Remove(spot);
string num2 = screen.Substring(++spot);
double num1Num;
double num2Num;
double result;
string resultString;
for (int i = num1.Length - 1; i >= 0; i--) //reduces everything behind num1
{
if (num1[i] == '*' || num1[i] == '/' || num1[i] == '+')
{
num1 = num1.Substring(i + 1);
break;
}
else if (num1[i] == '-')
{
if (i > 0 && (num1[i - 1] == '*' || num1[i - 1] == '/' || num1[i - 1] == '+' || num1[i - 1] == '-'))
{
num1 = num1.Substring(i);
break;
}
else
{
if (i == 0)
{
break;
}
else
{
num1 = num1.Substring(i + 1);
break;
}
}
}
}
for (int i = 0; i < num2.Length; i++) //reduces everythng after num2
{
if (i > 0 && (num2[i] == '*' || num2[i] == '/' || num2[i] == '+' || num2[i] == '-'))
{
num2 = num2.Remove(i);
break;
}
}
num1Num = Convert.ToDouble(num1);
num2Num = Convert.ToDouble(num2);
result = CalcMath.CalcSubtract(num1Num, num2Num);
result = Math.Round(result, 9);
resultString = Convert.ToString(result);
screen = screen.Replace(num1 + '-' + num2, resultString);
}
return(screen);
}
public static string CalculateExponents(string screen) //include */+- ...
{
active = false;
int startNum = 0;
int startPower = 0;
int endParenthesis = 0;
string num = "";
string power1 = "";
string power2 = "1";
string miniScreen = ""; //holds the num and exponent
string resultString = ""; //result after everything as string
double numNum = 0;
double power1Num = 0;
double power2Num = 1;
double result = 0; //result after everything
for (startPower = 0; startPower < screen.Length; startPower++) //records ^ of power
{
if (screen[startPower] == '^' && screen[startPower + 1] == '(')
{
active = true;
break;
}
}
if (active == true)
{
for (endParenthesis = startPower; endParenthesis < screen.Length; endParenthesis++) //records end parenthesis for power
{
if (screen[endParenthesis] == ')')
{
break;
}
}
for (startNum = startPower - 1; startNum >= 0; startNum--) //records start of num
{
if (startNum == 0 || screen[startNum] == '*' || screen[startNum] == '/' || screen[startNum] == '+')
{
break;
}
else if (screen[startNum] == '-' && (startNum == 0 || startNum - 1 == '*' || startNum - 1 == '/' || startNum - 1 == '+' || startNum - 1 == '-'))
{
}
}
num = screen.Remove(startPower);
num = num.Substring(startNum);
numNum = Convert.ToDouble(num);
power1 = screen.Remove(endParenthesis);
power1 = power1.Substring(startPower + 2); //really just the base power for now
miniScreen = num + "^(" + power1 + ")";
for (int i = 0; i < power1.Length; i++)
{
if (power1[i] == '/')
{
power2 = power1.Substring(i + 1);
power1 = power1.Remove(i);
break;
}
}
power1Num = Convert.ToDouble(power1);
power2Num = Convert.ToDouble(power2);
result = CalcMath.CalcToPower(numNum, power1Num, power2Num);
result = Math.Round(result, 9);
resultString = Convert.ToString(result);
screen = screen.Replace(miniScreen, resultString);
}
return(screen);
}