Steve Robinson | Permutation Generator | C++

//Generates permutations of combinations of elements

#include <iostream>

using namespace std;

void perm(int a[],int k,int n)
{
    if(k==n)
    {
        for(int i=1;i<=n;i++)
            cout<<a[i]<<" ";
        cout<<endl;
    }
    else
    {
        for(int i=k;i<=n;i++)
        {
            int t=a[k];
            a[k]=a[i];
            a[i]=t;
            perm(a,k+1,n);
            t=a[k];
            a[k]=a[i];
            a[i]=t;

        }
    }
}

int main()
{
    int a[4]={0,1,2,3};  //use your own type and values
    perm(a,1,3);     //k=1 always at start
    return 0;
}