 # How to reverse a number in c++ program

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Today will discuss the basic concept and simplest way to how to reverse a number in c++ by programming and how to make program for reverse of a number without array in c++ programming. How to how to count number of digit in a number in c++ programming.

## Write a program to reverse a number

#include <iostream>
using namespace std;
int main()
{
int n, r=0,d;
cout<<“Enter the number=”<<endl;
cin>>n;
cout<<“Number befour reverse= “<<n <<endl;
while(n>0){
d= n%10;
r= r*10+d;
n=n/10;
}
cout<<“Number After reverse= “<<r<<endl;
return 0;
}
Output:
Enter the Number= 1234
Number befour reverse= 1234
Number After reverse= 4321

program to count no of digit of a number

#include <iostream>
using namespace std;
int main()
{
int n, c=0,d;
clrscr();
cout<<“Enter the number: “<<endl;
cin>>n;
while(n>0){
d= n%10;
n=n/10;
c++;
}
cout<<“The enter number have”<< d <<“digit”;
return 0;
}
Output:
Enter the Number: 1234
The enter number have 4 digit
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