float POSTFIX_EVALUATION(char* postfix_arr, int lengthofpostfix)
{
STACK<float> STACK; //Initializes evaluation float stack
float answer = 0, temp = 0, operandx = 0, operandy = 0; //Final evaluated answer variable
int i = 0, c = 0; //Counters and operand variables
char op, check; //Operator variable
for (c = 0; c < lengthofpostfix; c++) //For postfix equation
{
(char)postfix_arr[i];
if (postfix_arr[i] >= 'a' && postfix_arr[i] <= 'z'){ //If operand
STACK.PUSH2((float)postfix_arr[i]); //PUSHes operand to stack
i++; //Increments postfix array
}
else if(postfix_arr[i] == '+' || postfix_arr[i] == '-' || postfix_arr[i] == '/' || postfix_arr[i] == '*'|| postfix_arr[i] == '^'){ //If Operator
op = postfix_arr[i]; //Sets operator to postfix array slot
operandx = STACK.POP2(); //Retrieves operand 1 from stack
operandy = STACK.POP2(); //Retrieves operand 2 from stack
answer = solve(op,operandy,operandx); //Solves the postfix
STACK.PUSH2(answer); //Pushes the answer onto the stack
i++; //Moves to next value in postfix array
}
}
answer = STACK.Return_Top_of_Stack2(); //Returns final answer from stack
STACK.POP2();
return answer;
}
