c - Lexicographic order permutation -


i trying work on getting program print out numbers 1-4 in lexicographic order. able permute array of ints. 

#include <stdio.h>  #define len 4  void swap(int array[], int i, int j); void permute(int array[], int low, int len);  int main() {   int array[len], i;    (i = 0; < len; i++)     array[i] = + 1;    permute(array, 0, len); }   void permute(int array[], int low, int len) {   int i;    if (low >= len - 1 ) {     (i = 0; < len; i++)       printf("%d ", array[i]);     printf("\n");   }   else {     (i = low; < len; i++) {       swap(array, low, i);       permute(array, low+1 , len );       swap(array, low, i);     }   } }   void swap(int array[], int i, int j) {   int temp = array[i];   array[i] = array[j];   array[j] = temp; }

i have used recursion within program , swap methods swap numbers. explanation of how approach or example great.

example be:

this output

1234  1243  1324  1342  1432 ....

this output should be

1234  1243  1324  1342  1423 ....

notice how last number different output.


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