permutation

#include <stdio.h>

int i;
int number[4]= {0,1,2,3};

void display(int n){


    if(n==4)

        return;


    for(i =0; i<4; i++){

        //if(number[i] != n)
        printf(" %d %d",n, number[i]);

        printf("\n");

        }



    display(n+1);


    }



int main(int argc, char **argv)
{


    display(0);


    return 0;
}