public class stack {
	
	public int top = -1;
	public int[] stackChar = new int[20];
	
	public void push(int a){
		
		top++;
		if(top == 20){
			System.out.println("¿À¹öÇ÷οì¹ß»ý");
			return;			
		}		
		stackChar[top] = a;
		
	}
	
	public int pop(){
		
		int operator = 0 ;		
		
		
		
		if(top == -1){
			System.out.println("¾ð´õÇ÷οì¹ß»ý");
			return 0;
		}
		operator = stackChar[top];	
		stackChar[top] = 0;
		top--;
		
		return operator;
	}
	
	
	public int seeStackValue(){
			
		return stackChar[top];
	}
	
	public void seeStack(){
		for(int i=0;i<stackChar.length;i++){
			System.out.print(stackChar[i] + " ");
		}
	}

}