String permutation

stringPermutation.c

#include <stdio.h>
#include <string.h>
#define MAX 50

void permutations(char *string, int k, int m);
void swap(char *x, char *y);

int main(int argc, char *argv[])
{
    // char string[MAX];
    int k, m;

    /* printf("\n Enter string: "); */
    /* scanf("%s", string); */

    permutations(argv[1], 0, strlen(argv[1]));
    return 0;
}

void swap(char *x, char *y)
{
    char temp;
    temp = *x;
    *x = *y;
    *y = temp;
}

void permutations(char *string, int k, int m)
{
    int i;
    if (k == m) {
        printf("%s\n", string);
    }
    else
        for (i = k; i < m; i++){
            swap(&string[k], &string[i]);
            permutations(string, k+1, m);
            swap(&string[k], &string[i]);
        }
}