SCANF的程序不在Visual Studio代码中执行

Question

我是C编程的新手，每当我尝试使用SCANF运行代码时，我都不会执行。

#include <stdio.h>
int main() 
{
int a,b,s;
printf("Enter the first no: \n");
scanf("%d",&a);
printf("Enter the second number: \n");
scanf("%d",&b);
s=a+b;
printf("%d",s);
}

I get this output:

[Running] cd "c:\msys64\mingw32\bin\" && gcc Prog1.c -o Prog1 && "c:\msys64\mingw32\bin\"Prog1

and this upon termination:

[Done] exited with code=1 in 6.586 seconds

The exact same code works without scanf.

#include <stdio.h>
int main()
{
int a=3,b=5,s;
printf("Enter first no: \n");
printf("Enter the second no: \n");
s=a+b;
printf("%d",s);
}

Output:

Enter first no: 
Enter the second no: 
8

This is what happens on executing in cmd prompt:

[1]: https://i.sstatic.net/o08a9.jpg