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import java.util.*;
public class Post{
static int eval(String s){
Stack<Integer> st = new Stack<>();
for(int i=0;i<s.length();i++){
char c = s.charAt(i);
if(Character.isDigit(c))
st.push(c-'0');
else{
int val1 = st.pop();
int val2 = st.pop();
switch(c){
case '+':
st.push(val1+val2);
break;
case '-':
st.push(val2-val1);
break;
case '/':
st.push(val2/val1);
break;
case '*':
st.push(val2*val1);
break;
}
}
}
return st.pop();
}
public static void main(String[] args){
String s = "35*62/+4-";
System.out.println("Evaluated: "+eval(s));
}
}
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