PROGRAM MENGUBAH NOTASI INFIX KE POSTFIX....
package tugas5;
import java.io.IOException;
import java.util.*;
public class inkepos {
private
Stack theStack;
private
String input;
private
String output = "";
public inkepos(String in) {
input = in;
int stackSize = input.length();
theStack = new Stack(stackSize);
}
public String doTrans() {
for (int j = 0; j < input.length(); j++) {
char ch = input.charAt(j);
switch (ch) {
case '+':
case '-':
gotOper(ch, 1);
break;
case '*':
case '/':
gotOper(ch, 2);
break;
case '(':
theStack.push(ch);
break;
case ')':
gotParen(ch);
break;
default:
output = output + ch;
break;
}
}
while (!theStack.isEmpty()) {
output = output + theStack.pop();
}
System.out.println(output);
return output;
}
public void gotOper(char opThis, int prec1) {
while (!theStack.isEmpty()) {
char opTop = theStack.pop();
if (opTop == '(') {
theStack.push(opTop);
break;
}
else {
int prec2;
if (opTop == '+' || opTop == '-')
prec2 = 1;
else
prec2 = 2;
if (prec2 < prec1)
{
theStack.push(opTop);
break;
} else
output = output + opTop;
}
}
theStack.push(opThis);
}
public void gotParen(char ch){
while (!theStack.isEmpty()) {
char chx =
theStack.pop();
if (chx == '(')
break;
else
output = output + chx;
}
}
public
static void main(String[] args) throws IOException {
System.out.println("===============================================");
System.out.println("PROGRAM MENGUBAH EKSPRESI DARI INFIX KE
POSTFIX");
System.out.println("===============================================");
System.out.println("Input Exspresi Infix: ");
Scanner niluh = new Scanner(System.in);
String input = niluh.next();
String output;
System.out.print("Output Postfix : ");
inkepos theTrans = new inkepos(input);
output = theTrans.doTrans();
}
class
Stack {
private int maxSize;
private char[] stackArray;
private int top;
public Stack(int max) {
maxSize = max;
stackArray = new char[maxSize];
top = -1;
}
public
void push(char j) {
stackArray[++top] = j;
}
public char pop() {
return stackArray[top--];
}
public char peek() {
return stackArray[top];
}
public boolean isEmpty() {
return (top == -1);
}
}
}
OUTPUT PROGRAM
