scanf的返回值

参考这个博客，https://blog.csdn.net/sinat_40936062/article/details/84348021

#include<stdio.h>

int main(void)
{
    int t;
    if (scanf_s("%d", &t) == 1)
    {
        printf("%d
", t);
    }
    else
    {
        printf("Failed to read integer.
");
    }

    return 0;
}