Question: please, update the code based on Question's request. So your your program could handle one of the following: Decimal numbers, OR Reminder (%), OR Parenthesis
please, update the code based on Question's request.
So your your program could handle one of the following:
Decimal numbers, OR Reminder (%), OR Parenthesis
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import java.util.Scanner;
import java.util.Stack;
public class Evaluate {
public static void main(String[] args) {
Stack
Stack
operatorStack.push('#');
Scanner io = new Scanner(System.in);
System.out.print("Enter an expression: ");
String input = io.next();
int len = input.length();
for (int i = 0; i < len; i++) {
//System.out.print(input.charAt(i));
char symbol = input.charAt(i);
if (!isOperator(symbol)) {
int n = Integer.parseInt(""+symbol);
operandStack.push(n);
} else {
char poppedOperator = operatorStack.pop();
if (prec(symbol) > prec(poppedOperator)) {
operatorStack.push(poppedOperator);
operatorStack.push(symbol);
} else {
int b = operandStack.pop();
int a = operandStack.pop();
if (poppedOperator == '*') {
operandStack.push(a * b);
} else if (poppedOperator == '/') {
operandStack.push(a / b);
} else if (poppedOperator == '+') {
operandStack.push(a + b);
} else if (poppedOperator == '-') {
operandStack.push(a - b);
} else {
//we will deal with it in future
}
operatorStack.push(symbol);
}
}
} //end of for loop
char poppedOperator = operatorStack.pop();
while (poppedOperator != '#') {
int b = operandStack.pop();
int a = operandStack.pop();
if (poppedOperator == '*') {
operandStack.push(a * b);
} else if (poppedOperator == '/') {
operandStack.push(a / b);
} else if (poppedOperator == '+') {
operandStack.push(a + b);
} else if (poppedOperator == '-') {
operandStack.push(a - b);
} else {
//we will deal with it in future
}
poppedOperator = operatorStack.pop();
}
System.out.println("Result = " + operandStack.pop());
}
private static int prec(char ch) {
if (ch == '*' || ch == '/')
return 10;
else if (ch == '+' || ch == '-')
return 5;
else if (ch == '#')
return 1;
else
return 0;
}
private static boolean isOperator(char ch) {
if (ch == '+' || ch == '-' || ch == '*' || ch == '/')
return true;
return false;
}
}
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