find inverse of number

Answer 1

double inv(double d) {
return 1/d;
}

Answer 2

#include <iostream>
using namespace std;
double inv(double);
int main() {
double y;
cin>>y;

inv(y);
return 0;
}
double inv(double d) {
double x;
x=1/d;
cout<<x<<endl;
}

Answer 3

there is a difference between inverse and reverse of a number

Answer 4

#include <iostream.h>
#include <conio.h>

void main()
{
  clrscr();  //clears the screen

        int n, num, digit, rev = 0;
     cout << "Enter a positive number: ";
     cin >> num;
     n = num;
     do
     {
         digit = num%10;
         rev = (rev*10) + digit;
         num = num/10;
     }while (num!=0);
     cout << " The reverse of the number is: " << rev 
getch();
}