[BOJ] 15815 천재 수학자 성필 (S3)

Author: abcxj123

정건우/11주차/260313.java

@@ -0,0 +1,47 @@
+//https://www.acmicpc.net/problem/15815
+import java.util.Scanner;
+import java.util.Stack;
+
+public class BOJ_S3_15815_천재수학자성필 {
+
+	public static void main(String[] args) {
+		Scanner scann = new Scanner(System.in);
+		
+		String s = scann.nextLine();
+		Stack<Long> stack = new Stack<>();
+	        
+	       for (char c : s.toCharArray()) {
+	           if (Character.isDigit(c)) {
+	        	   stack.push((long)(c - '0'));
+	           } else {
+	               long op2 = stack.pop();
+	               long op1 = stack.pop();
+	               long res = 0;
+	               
+	               switch (c) {
+	                   case '+':
+	                       res = op1 + op2;
+	                       break;
+	                   case '-':
+	                       res = op1 - op2;
+	                       break;
+	                   case '*':
+	                       res = op1 * op2;
+	                       break;
+	                   case '/':
+	                       res = op1 / op2;
+	                       break;
+	                   default:
+	                	   break;
+	               }
+	               
+	               stack.push(res);
+	           }
+	           
+	       }
+	       
+	       System.out.println(stack.pop());
+
+	}
+
+}