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#include <stdio.h>

 

int main(void)

{

    int choice, result;

    int a, b;

    while(1)

    {        printf("사칙연산할 두 수를 입력하세요.\n");

            printf("두 수 입력 :  ");

                scanf("%d %d,&a &b");

        printf("연산 방법 선택 : 1:덧셈, 2:뺄셈, 3:곱셈, 4:나눗셈 5:종료 : ");

            scanf("%d", &choice);

    switch(choice)

        { 

            case 1:

                result = a+b;

                printf("덧셈결과 : %d\n", result);

                break;

            case 2:

                result = a-b;

                printf("뺄셈결과 : %d\n", result);

                break;

            case 3:

                result = a*b;

                printf("곱셈결과 : %d\n", result);

            case 4:

                result = a/b;

                    {

                        if(b==0)

                            {

                                printf("0은 나눌 수 없습니다");

                                continue;

                            }

                    }

                printf("나눗셈결과 : &d\n", result);

                break;

            case 5:

                break;

                printf("종료합니다");

        }

    }

    return 0;

}