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9.0

Starting out on C looking for some help with switching

Asked by MrManderson in C Programming Language, Programming Languages

Hello Fellow EE Experts

Im starting out on C with the RPC calculator, Im a vb programmer so doing the program isnt the hard part its doing it in C with the correct syntax :D This is an assignment so I am looking for guidance through this not a direct answer. I have attached a version in VB that I have done however am having a harder time trying to implement in C.

I am going to take the following approach to solve this

1. Read from the command line via argv[]
2. Create an empty stack
3. Go through the command line arguments
4. If operand then add to stack or if operator pop top element from stack and set to temp location
5. Evaluate the top stack with the temp value then pop the stack and then push result
6. Loop through until all have been evaluated.
7. Pop the last remaining value from stack and return result.

So to start off my first question would be how would I implement a switch on the values passed in from command line seeing that the argv is of type string and a switch requires int. How would I do the conversion in C?

Ie.

#include <stdio.h>

int main(int argc, char *argv[])
{
int x;
while ( x < argc + 1)
      switch(argv[x])
      {
            case Number:
/*push to stack*/
            case '+':
/*pop from stack and so on.. */
            default:
            return 0;
}
}

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             Dim Stack As New ByteStack
 
  Public Sub Main()
    Dim Answer As Double
    Answer = EvaluateRPN("3 2 + 5 *")
    MsgBox "Answer is " & CStr(Answer), vbInformation, "RPN Calc"
    End
  End Sub
 
  Public Function EvaluateRPN(Expression As String) As Double
    Dim i As Integer
    Dim A As Double
    Dim C As Double
    Dim Expn() As String
    Stack.Initialize 128
    Expression = Replace(Expression, "  ", " ")
    Expn() = Split(Expression, " ")
    For i = 0 To UBound(Expn())
      Select Case Expn(i)
        Case "+"
          Stack.POP VarPtr(C), 8
          A = C + A
        Case "-"
          Stack.POP VarPtr(C), 8
          A = C - A
        Case "*"
          Stack.POP VarPtr(C), 8
          A = C * A
        Case "/", "\"
          Stack.POP VarPtr(C), 8
          A = C / A
        Case "^"
          Stack.POP VarPtr(C), 8
          A = C ^ A
        Case Else
          A = Val(Expn(i))
          Stack.PUSH VarPtr(A), 8
      End Select
    Next i
    EvaluateRPN = A
  End Function
           
         

20091021-EE-VQP-81 / EE_QW_EXPERT_20070906

Starting out on C looking for some help with switching

Asked by MrManderson in C Programming Language, Programming Languages

About this solution