scanf的返回值

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

 #include<stdio.h>

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

     return ;
 }