Read a 3-digit number and write a program for swapping its first and last digits

#include<stdio.h>
#include<conio.h>
{
clrscr();
int num,d1,d2,d3;
printf("Enter a 3-digit number");
scanf("%d",&num);
d1=num%10;
num=num/10;
d2=num%10;
d3=num/10;
int resnum=d1*100+d2*10+d3;
printf("Required No.=%d",resnum);
getch();
}