How to find the result of the math equation given as a string in C#? Ex: "2+5*3+7" should return 3 and "(2+5)*(3+7)" should return 70... just any math equation. I tried splitting the string into Substring based on the position of the operator but failed.
int strStart = 0, strLength = 0, result =0, no=0;
List<char> ops = new List<char>();
foreach (char c in inputString)
{
if (IsOperator(c))
{
strLength = inputString.IndexOf(c) - strStart;
Console.WriteLine("String Length = " + strLength);
if (ops.Count == 1)
result = Convert.ToInt32(inputString.Substring(strStart, strLength));
else
{
no = Convert.ToInt32(inputString.Substring(strStart, strLength));
result = Math(result, no, c);
}
strStart = strStart + strLength + 1;
}
}
no = Convert.ToInt32(inputString.Substring(strStart, strLength));
result = Math(result, no, op);
Somehow i keep messing up on the strLength variable. Then I tried this
List<char> operators = new List<char>();
foreach (char c in stringValue)
{
try
{
int i = Convert.ToInt32(c.ToString());
}
catch
{
operators.Add(c);
}
}
int totalOperators = operators.Count;
string[] stringValues = new string[totalOperators + 1];
int[] indexes = new int[totalOperators];
for(int j=0;j<totalOperators;j++)
indexes[j] = stringValue.IndexOf(operators.ElementAt(0));
stringValues[0] = stringValue.Substring(0, indexes[0]) ;
for(int k=1;k<totalOperators;k++)
{
stringValues[k] = stringValue.Substring(indexes[k - 1], indexes[k] - indexes[k - 1]);
}
stringValues[totalOperators] = stringValue.Substring(indexes[totalOperators - 1], stringValue.Length- indexes[totalOperators - 1]);
int[] intValues = new int[totalOperators + 1];
for (int j = 0; j <= totalOperators; j++)
intValues[j] = Convert.ToInt32(stringValues[j]);
int result = intValues[0];
for (int k = 0; k < totalOperators; k++)
{
char c = operators.ElementAt(k);
switch (c)
{
case '+':
result += intValues[k + 1];
break;
}
}
it failed for addition, so i didn't even add the other cases, kindly help me out. Is there any class/library available to simplify the process?
