scanf（）跳过，fflush（）是未解析的标识符

Question

我正在尝试执行以下程序，用户输入数字直到他希望，但我的第二个scanf（）被跳过。我尝试给scanf（“％[^ \ n] d”，＆amp; ans），但它不起作用。 Fflush（stdin）在netbeans中不起作用。请帮助并解释它为什么会发生。

int Ch5BG()
{
    int number,positive,negative,zero;
    char ans='y';
    positive=negative=zero=0;

    while(ans=='y'||ans=='Y')
    {
        printf("Please enter a number:\n");
        scanf("%d",&number);

        if(number>0)
            positive++;
        if(number<0)
            negative++;
        if(number==0)
            zero++;


        printf("Do you want to continue:");
        scanf("%c",&ans);

    }
    printf("The number of positives entered are:%d",positive);
    printf("The number of negatives entered are:%d",negative);
    printf("The number of zeros entered are:%d",zero);

    return 0;
}

输出如下：

Please enter a number:
3
Do you want to continue:The number of positives entered are:1The number of negatives entered are:0The number of zeros entered are:0
RUN SUCCESSFUL (total time: 1s)