'Reversing the digits of a number in C++

I am trying to reverse the digits of a number. I used strings in it. And I am bound to use strings. Program just give last digit and stop executing. For instance if I put 123 as an input and I only get 3. Instead I should be having 321.

#include <iostream>
#include <string>
using namespace std;

int main()
{
    int a,b=0;
    cin>>a;
    string str1="", str="";
 for(int i=0;a>0;i++)
 {
 
     b=a%10;
     str=to_string(b);
     a=a/10;
     str1=str1+str;
     
 }
 cout<<str1.length();
 }
c++reverse


Solution 1:[1]

You're printing the string length rather than string itself.

Solution 2:[2]

You are Printing length of string .length() is a builtin function provided by strings. Try running it again by removing .length() keyword from cout command i.e. cout << str1

Sources

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Source: Stack Overflow

Solution Source
Solution 1 SomeWittyUsername
Solution 2 Umar Tahir

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