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A # include <stdio.h>

/* Function to swap values at two pointers */
void swap (char *x, char *y)
{
char temp;
temp = *x;
*x = *y;
*y = temp;
}

/* Function to print permutations of string
This function takes three parameters:
1. String
2. Starting index of the string
3. Ending index of the string. */


void permute(char *a, int i, int n)
{
int j;
if (i == n)
printf("%s\n", a);
else
{
for (j = i; j <= n; j++)
{
swap((a+i), (a+j));
permute(a, i+1, n);
swap((a+i), (a+j)); //backtrack
}
}
}

/* Driver program to test above functions */
int main()
{
char a[] = "ABC";
permute(a, 0, 2);
return 0;
}

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A For i=0 to N
1. Swap letters 0 and i.
2. Permute letters 1 to N-1, printing or saving the entire string each time.

Permute(char* inputStart, char* current)
{
char *swap;
char temp;

if(*(current + 1) = '\0')
printf("%s\n", inputStart);
else
{
for(swap = current; *swap != '\0'; ++swap)
{
temp = *swap;
*swap = *current;
*current = temp;

Permute(inputStart, current + 1);

//revert the letters
*current = *swap;
*swap = temp;
}
}
}