Testing VS2013 express for desktop

#include <stdio.h>
#include <stdlib.h>

int main()
{

float in_cm;
char in_inches[4];

printf("Convert inches: ");
scanf_s("%s", &in_inches);

in_cm = atoi(in_inches)*2.54;

printf("%.2f cmn", in_cm);
return(0);

}

I am testing out this code and when i input a value to the command prompt to Convert Inches:

When i press "enter" in my keyboard the command prompt closes, can anybody help?

I am doing C.

Looks like you could use the advice of this post:

http://www.cplusplus.com/forum/beginner/1988/
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