public void evaluate(string postexp, string infix)
{
FileStream aFile = new FileStream("C:/Output.txt", FileMode.Create, FileAccess.Write);
StreamWriter sw = new StreamWriter(aFile);
byte[] chr = new byte[100];
int i = 0, size = postexp.Length;
intstack stk = new intstack(size);
while (i < size)
{
char ch = postexp[i];
if (ch == '#')
{
double operand = Convert.ToInt32(postexp[++i]) - 48;
stk.push(-1 * operand);
}
else if (ch >= '0' && ch <= '9')
{
double operand = Convert.ToInt32(ch) - 48;
stk.push(operand);
}
else if (ch == '+' || ch == '-' || ch == '*' || ch == '/')
{
double op1 = stk.pop();
double op2 = stk.pop();
if (ch == '+')
{
sw.WriteLine("ADD {0},{1},{2}", "reg", op2, op1);
double reg = op2 + op1;
stk.push(reg);
}
else if (ch == '-')
{
sw.WriteLine("SUB {0},{1},{2}", "reg", op2, op1);
double reg = op2 - op1;
stk.push(reg);
}
else if (ch == '*')
{
sw.WriteLine("MUL {0},{1},{2}", "reg", op2, op1);
double reg = op2 * op1;
stk.push(reg);
}
else if (ch == '/')
{
sw.WriteLine("DIV {0},{1},{2}", "reg", op2, op1);
double reg = op2 / op1;
stk.push(reg);
}
}
i++;
}
sw.WriteLine(" ");
sw.WriteLine(" ");
sw.WriteLine("\t\t\tResult:\t{0}", stk.pop());
sw.WriteLine("\n\n\t\tPrepeared By:\n\t\t\t\tBenjamin Ngarambe");
sw.Close();
}
//this function will take the postfix expression then solve that expression according to the one address mode
public void evaluate(string postexp, string infix)
{
FileStream aFile = new FileStream("C:/Output.txt", FileMode.Create, FileAccess.Write);//It is open in create mode because if there is any file by the name of output is already (in case of second expevaluation)remove that file first
StreamWriter sw = new StreamWriter(aFile);
byte[] chr = new byte[100];
int i = 0, size = postexp.Length;
intstack stk = new intstack(size);
while (i < size)
{
char ch = postexp[i];
if (ch == '#')//for negative sign
{
double operand = Convert.ToInt32(postexp[++i]) - 48;
stk.push(-1 * operand);
}
else if (ch >= '0' && ch <= '9')//for converting into the digit from character
{
double operand = Convert.ToInt32(ch) - 48;
stk.push(operand);
}
else if (ch == '+' || ch == '-' || ch == '*' || ch == '/')//for operators
{
double op1 = stk.pop();
double op2 = stk.pop();
if (ch == '+')
{
sw.WriteLine("LOAD {0}", op2);
double reg = op2;
sw.WriteLine("ADD {0}", op1);
reg += op1;
sw.WriteLine("STOR {0}", "stack");
stk.push(reg);
}
else if (ch == '-')
{
sw.WriteLine("LOAD {0}", op2);
double reg = op2;
sw.WriteLine("SUB {0}", op1);
reg -= op1;
sw.WriteLine("STOR {0}", "stack");
stk.push(reg);
}
else if (ch == '*')
{
sw.WriteLine("LOAD {0}", op2);
double reg = op2;
sw.WriteLine("MUL {0}", op1);
reg *= op1;
sw.WriteLine("STOR {0}", "stack");
stk.push(reg);
}
else if (ch == '/')
{
sw.WriteLine("LOAD {0}", op2);
double reg = op2;
sw.WriteLine("DIV {0}", op1);
reg /= op1;
sw.WriteLine("STOR {0}", "stack");
stk.push(reg);
}
}
i++;
}
sw.WriteLine(" ");
sw.WriteLine(" ");
sw.WriteLine("\t\t\tMOV Result:\t{0}", stk.pop());
sw.WriteLine("\n\n\t\tPrepeared By:\n\t\t\t\tBenjamin Ngarambe");
sw.Close();
}
//taking postfix expression into postexp and infix in infix(infix will take just for store in the output)
public void evaluate(string postexp, string infix)
{
FileStream aFile = new FileStream("C:/Output.txt", FileMode.Create, FileAccess.Write);
StreamWriter sw = new StreamWriter(aFile);
sw.WriteLine("\t\tAllmighty increase my knowlege");
sw.WriteLine("\tSharing Knowledge is wisdom & hiding knowledge is curse\n");
sw.WriteLine("\t\tExpression:\t{0}", infix);
int i = 0, size = postexp.Length; //size have the length of the postfix expression and i variable will count it
intstack stk = new intstack(size); //creating the stack for storing the operand after conversion into integer from character
while (i < size) //read untill the expression will end
{
char ch = postexp[i]; //geting the character of the expression
if (ch == '#') //for minus operand
{
double operand = Convert.ToInt32(postexp[++i]) - 48; //subtract 48 for converting the character into the integer
stk.push(-1 * operand);
}
else if (ch >= '0' && ch <= '9')//checking for the operand
{
double operand = Convert.ToInt32(ch) - 48;
sw.WriteLine("PUSH {0}", operand);
stk.push(operand);
}
else if (ch == '+' || ch == '-' || ch == '*' || ch == '/')//checking for the operator
{
double op1 = stk.pop();
double op2 = stk.pop();
if (ch == '+')
{
sw.WriteLine("ADD");
double reg = op2 + op1;
stk.push(reg);
}
else if (ch == '-')
{
sw.WriteLine("SUB");
double reg = op2 - op1;
stk.push(reg);
}
else if (ch == '*')
{
sw.WriteLine("MUL");
double reg = op2 * op1;
stk.push(reg);
}
else if (ch == '/')
{
sw.WriteLine("DIV");
double reg = op2 / op1;
stk.push(reg);
}
}
i++;//incrementing for reading the next character in the postfix string and termenating the loop
}
sw.WriteLine(" ");
sw.WriteLine(" ");
sw.WriteLine("\t\t\tPOP Result:\t{0}", stk.pop());
sw.WriteLine("\n\n\t\tPrepeared By:\n\t\t\t\tBenjamin Ngarambe");
sw.Close();//closing the file
}