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Source Code
Language
#include <stdio.h>
#include <string.h>
// Function to swap values at two pointers
void swap(char* x, char* y)
{
char temp;
temp = *x;
*x = *y;
*y = temp;
}
void permute(char* a, int l, int r)
{
int i;
if (l == r)
printf("%s\n", a);
else {
for (i = l; i <= r; i++) {
swap((a + l), (a + i));
permute(a, l + 1, r);
swap((a + l), (a + i)); // backtrack
}
}
}
int main()
{
char str[] = "ABCD";
int n = strlen(str);
permute(str, 0, n - 1);
return 0;
}
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