c 全排列

來源:互聯網
上載者:User

#include <stdio.h>
#include <stdlib.h>

void swap(char*
a, char* b);
void perm(char* l, int i, int n);

void perm( char* l,
int i, int n)
{
int j;
if(i == n-1) {
for(j = 0; j < n;
j++){
printf("%c", l[j]);
printf("");
}
}
else{
for(j = i; i
< n; j++){
swap(&l[j], &l[i]);
perm(l, j+1,
n);
swap(&l[j], &l[i]);
}
}

}

void swap(char* a,
char* b)
{
char temp;
temp = *a;
*a = *b;
*b =
temp;
}

void main()
{
char list[5] = {'A', 'B', 'C', 'D',
'E'};
perm(list, 0, 5);
system("pause");

}

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