1 치면 숫자 입력받아서 넣고.. 2 치면 넣어있는 숫자하나 빼고,  뺀 숫자 출력하고..  3치면 연산자 입력받아서 연산해서 결과 출력하는 건데..

위에 사진처럼 뜨는데.. 머가 잘못 된겨??
-----------------------------------------

#include<stdio.h>

void main()
{
    int stack[10];
    int top=0;

    int select;
    char ch1;

    while(select < 4)
    {
        printf("<1> push  <2> pop  <3> 연산");
        scanf("%d",&select);

        switch(select)
        {
            case 1:
                if(top>=10)
                {
                    printf("꽉 차서 숫자가 못 들어감\\n");
                }
                else
                {
                    printf("push될 숫자를 입력 :",stack[top]);
                    scanf("%d",&stack[top]);
                    top++;
                }
                break;

            case 2:
                if(top<=0)
                {
                    printf("빠져나갈 숫자가 없음\\n");
                }
                else
                {
                    top--;
                    printf("%d 이 빠져나감\\n",stack[top]);
                    stack[top]=\' \';
                }
                break;

            case 3:
                printf("[ + - * / ] 중 하나를 입력 :",ch1);
                scanf("%*%c",&ch1);

                switch(ch1)
                {
                    case \'+\':
                        stack[top] = stack[top] + stack[top+1];
                        printf("%d + %d = %d\\n",stack[top],stack[top+1]);
                        break;

                    case \'-\':
                        stack[top] = stack[top] - stack[top+1];
                        printf("%d - %d = %d\\n",stack[top],stack[top+1]);
                        break;

                    case \'*\':
                        stack[top] = stack[top] * stack[top+1];
                        printf("%d * %d = %d\\n",stack[top],stack[top+1]);
                        break;

                    case \'/\':
                        stack[top] = stack[top] / stack[top+1];
                        printf("%d / %d = %d\\n",stack[top],stack[top+1]);
                        break;

                    default:
                        printf("연산자를 잘못 입력하셨습니다.\\n");
                    }

            default:
                printf("잘못 입력하셨습니다. 다시 입력하세요\\n");
        } 
    }
}