To Shift the Three Numbers a,b,c in Circular order

#include<stdio.h>
    #include<ctype.h>
    #include<conio.h>
    #include<stdlib.h>
    
    void circular_shift(int &x,int &y,int &z)
    {
    x=x+y;
    y=x-y;
    x=x-y;
    x=x+z;
    z=x-z;
    x=x-z;
    return;
    
    }
    int main()
    {
     int a,b,c;
     a=5;b=8;c=10;
     clrscr();
     printf(" \n %d %d %d ",a,b,c);
     circular_shift(a,b,c);
     printf(" \n %d %d %d ",a,b,c);
     circular_shift(a,b,c);
     printf(" \n %d %d %d " ,a,b,c);
     getch();
     return(0);
    }