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Write a program to reverse the string. input = google output = elgoole */

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  #include <iostream>   #include <string>   using namespace std; void rvrsstr(string a) //rvrsstr=reverse string:user function {     if (a.size()==0)         { return ;}         rvrsstr(a.substr(1));         cout<<a[0];                           }     int main()     {   string a;          a= "google" ;          rvrsstr(a);       return 0;      }
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Write the program to make Permutation(arrangements of string ) of a string .

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http://cpp.sh/6tjpq   some points :- 1_ )Permutation :- A permutation is a mathematical technique      that determines the number of possible arrangements in a set     when the order of the arrangements matters.     2_ ) Syntex   :: string.substr(i  , ln  )       Use of this Syntex :- to make        substring (i.e make small         String from big string).      i = i represent index.      ln= ln represent lenth of string           ex:- let string  a = "abgs" ;             cout<<a.substr(0,0) //print nothing lenth is zero             cout<<a.substr(0,1) //print 'a' because at zero index 'a' is present and length is 1     ...
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2) .cheak even and odd nmbr\\\

//Check even or odd number #include <iostream> using namespace std; int main() {  int a,b;   cin>>a;     if (   a%2==0  )       {cout<< " a is even nmber" ;     }     else cout << "a is odd nmbr" ;       return 0;     }    
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