practice/Rotate String at main · GauriSriv/practice · GitHub

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

void rotate(char a[],int n)
{ //1. move every character every one posn ahead
    int len=strlen(a);
    int i=len-1;
    //cout<<a<<endl;
    while(i>=0)
    {
        a[i+n]=a[i];
        i--;
    }
    //cout<<a<<endl;

    //step 2.
     i=0;
    int j=len;

    while(i<n)
    {
        a[i]=a[j];
        i++;
        j++;
    }
   // cout<<a<<endl;

    //step 3 . delete last n characters

    a[len]='\0';
   // cout<<a<<endl;

}
int main()
{
    char a[100];
    cin.getline(a,100);

    int n;
    cin>>n ; // no. of rotation we want to do;
    cout<<"before rotation:"<<a<<endl;
    rotate(a,n);
   cout<<"after roatation:"<<a<<endl;
    return 0;
}