Pancake Sort in C - Sanfoundry

This C Program Implements Pancake Sort on Array of Integers.Pancake sorting is a variation of the sorting problem in which the only allowed operation is to reverse the elements of some prefix of the sequence.

Here is source code of the C Program to Implement Pancake Sort on Array of Integers. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C Program to Implement Pancake Sort on Array of Integers

```
 */
```
```
#include <stdio.h>
```
```
#include <stdlib.h>
```
```
 
```
```
void do_flip(int *, int, int);
```
```
 
```

/*Function to implement the pancake sort*/

int pancake_sort(int *list, unsigned int length)

```
{
```
```
    if (length < 2)
```
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        return 0;
```
```
    int i, a, max_num_pos, moves;
```
```
 
```
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    moves = 0;
```
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    for (i = length;i > 1;i--)
```
```
    {
```
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        max_num_pos = 0;
```
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        for (a = 0;a < i;a++)
```
```
        {
```

            if (list[a] > list[max_num_pos])

```
                max_num_pos = a;
```
```
        }
```
```
        if (max_num_pos ==  i - 1)
```
```
            continue;
```
```
        if (max_num_pos)
```
```
        {
```
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            moves++;
```

            do_flip(list, length, max_num_pos + 1);

```
        }
```
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        do_flip(list, length, i);
```
```
    }
```
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    return moves;
```
```
}
```
```
 
```

/*Function to do flips in the elements*/

void do_flip(int *list,  int length,  int num)

```
{
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```
    int swap;
```
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    int i = 0;
```
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    for (i;i < --num;i++)
```
```
    {
```
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        swap = list[i];
```
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        list[i] = list[num];
```
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        list[num] = swap;
```
```
    }
```
```
}
```
```
 
```
```
/*Function to print the array*/
```

void print_array(int list[], int length)

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{
```
```
    int i;
```
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    for (i = 0;i < length;i++)
```
```
    {
```
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        printf("%d ", list[i]);
```
```
    }
```
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}
```
```
 
```
```
int main(int argc,  char **argv)
```
```
{
```
```
   int list[9];
```
```
   int i;
```

   printf("enter the 9 elements of array:\n");

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   for (i = 0;i < 9;i++)
```
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       scanf("%d", &list[i]);
```
```
   printf("\nOriginal: ");
```
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   print_array(list, 9);
```
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   int moves  =  pancake_sort(list, 9);
```
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   printf("\nSorted: ");
```
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   print_array(list, 9);
```

   printf(" - with a total of %d moves\n",  moves);

```
}
```

$ cc pancake.c
$ a.out
enter the 9 elements of array:
10
9
8
7
6
5
4
3
2
 
Original: 10 9 8 7 6 5 4 3 2
Sorted: 2 3 4 5 6 7 8 9 10   - with a total of 0 moves
$ a.out
enter the 9 elements of array:
1
2
3
4
5
6
7
8
9
 
Original: 1 2 3 4 5 6 7 8 9
Sorted: 1 2 3 4 5 6 7 8 9   - with a total of 0 moves
$ a.out
enter the 9 elements of array:
5
6
7
8
9
1
4
2
3
Original: 5 6 7 8 9 1 4 2 3
Sorted: 1 2 3 4 5 6 7 8 9   - with a total of 3 moves

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