scanf가 왜 오류가 나나요..?

warning C4996: 'scanf': This function or variable may be unsafe. Consider using scanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

이게 오류내용입니다..scanf가 아예 안먹네요 하나만 해봐도 안되구요...뭐 틀린곳이 있나요..?

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 #include <stdio.h>
 
main()
{
    int fir,sec,op;
 
    printf("첫번째 계산할 값을 입력하세요 ==> \n");
    scanf("%d",&fir);
    printf("<1>덧셈 <2>뺄셈 <3>곱셈 <4>나눗셈 ==> \n");
    scanf("%d",&op);
    printf("두번째 계산할 값을 입력하세요 ==> \n");
    scanf("%d",&sec);
    
    switch(op){
        case 1:
            printf("%d + %d = %d",fir,sec,fir+sec);
            break;
        case 2:
            printf("%d - %d = %d",fir,sec,fir-sec);
            break;
        case 3:
            printf("%d * %d = %d",fir,sec,fir*sec);
            break;
        case 4:
            printf("%d / %d = %d",fir,sec,fir/sec);
    }
}
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