Help me with this one I'm a beginner

Question

Sum and Return the result in reverse order
int num, add, digit;
cout <<Insert a number:
cin>>num;
while (num!=0)
digit=num%10;
num=num/10;
//now adding an increment
int ant = digit +add;
//Now the new number in reverse order
ant=ant×10+digit;
cout <<the new number is <<ant <<endl;

Answer 1

#include<iostream.h>
void main()
{
int num,digit,ant=0;
cout <<"Insert a number";
cin>>num;
while (num>0)
{
digit=num%10;
num=num/10;
ant=ant×10+digit;
}
cout <<"the new number is "<<ant<<endl;
}

Answer 2

be careful with the syntax of every thing
like..
cout<<"....";
the quotation marks, semicolon etc..

Answer 3

Good answer, but I must pick the result of this operation and add an increment and give the result in reverse order.