显示答案错误 说忽略了scanf的返回值

每次都是说是答案错误 说是忽略了scanf的返回值 这种到底该怎么样才是每个忽略他的返回值

供参考：

#include <stdio.h>
int main()
{
    int A,B,C,D,E,F,G,ret;
    ret = scanf("%d%d", &A, &B);
    if (ret == 2){
        C = A + B;
        D = A - B;
        E = A * B;
        F = A / B;
        G = A % B;
        printf("%d + %d = %d\n",A,B,C);
        printf("%d - %d = %d\n",A,B,D);
        printf("%d * %d = %d\n",A,B,E);
        printf("%d / %d = %d\n",A,B,F);
        printf("%d %% %d = %d\n",A,B,G);
    }
    return 0;
}

改成scanf_s吧