Function and Swicth Case Class

#include<stdio.h>
    int x=5,y=5,add,divide,sub;

    int addsum()
    {
        add = x+y;
        return add;
    }
    int diviesum()
    {
        divide = x/y;
        return divide;
    }
    int subsum()
    {
        sub = x-y;
        return sub;
    }
    int main()
    {
    int fun;
        printf("Hello User Enter 1 For Add or 2 Divie or Sub\n");
        scanf("%d",&fun);
        switch(fun)
        {
            case 1:
            printf("Your Add Is = %d\n",addsum());
            break;
            case 2:
            printf("Your Add Is = %d\n",diviesum());
            break;
            case 3:
            printf("Your Add Is = %d\n",subsum());
            break;
            default :
            printf(" Your Input Is Wrong !");
        }
        return 0;
    }