C scanf char array

Question

my problem is that the printf does not get me any output. I'm totally confused. Any idea why?

#include <stdio.h>

int main(){

char var[50];
scanf_s("%s", var); // visual studio force me to use scanf_s
printf("In: %s\n", var); // the output is just 'In:'

system("PAUSE");
return 0;
}

Answer 1

scanf_s需要大小作为参数。

scanf_s("%s", var, 50);