What will be the output of the following program?

#include stdio.h
    void main()
    {
        double ch;
        printf("enter a value between 1 to 2:");
        scanf("%lf", &ch);
        switch (ch)
        {
           case 1:
              printf("1");
              break;
           case 2:
              printf("2");
              break;
        }
    }