C++ Program to Print All Permutations using BackTracking

This C++ Program demonstrates the generation of all Permutations using BackTracking.

Here is source code of the C++ Program to Generate All Permutations using BackTracking. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Generate All Permutations using BackTracking

```
 */
```
```
#include <iostream>
```
```
#include <cstdio>
```
```
#include <cstring>
```
```
#include <cstdlib>
```
```
using namespace std;
```
```
 
```
```
/* swap values at two pointers */
```
```
void swap (char *x, char *y)
```
```
{
```
```
    char temp;
```
```
    temp = *x;
```
```
    *x = *y;
```
```
    *y = temp;
```
```
}
```
```
 
```
```
/* print permutations of string */
```
```
void permute(char *a, int i, int n)
```
```
{
```
```
    int j;
```
```
    if (i == n)
```
```
        cout<<a<<endl;
```
```
    else
```
```
    {
```
```
        for (j = i; j <= n; j++)
```
```
        {
```
```
            swap((a + i), (a + j));
```
```
            permute(a, i + 1, n);
```
```
            swap((a+i), (a + j));
```
```
       }
```
```
   }
```
```
}
```
```
 
```
```
/* Main*/
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```
int main()
```
```
{
```
```
    char a[] = "abcd";
```
```
    permute(a, 0, 3);
```
```
    return 0;
```
```
}
```

$ g++ permutations_back.cpp
$ a.out
 
abcd
abdc
acbd
acdb
adcb
adbc
bacd
badc
bcad
bcda
bdca
bdac
cbad
cbda
cabd
cadb
cdab
cdba
dbca
dbac
dcba
dcab
dacb
dabc
 
------------------
(program exited with code: 1)
Press return to continue

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