C Program to Find All Possible Subsets of Given Length in String

This C Program Find all possible subsets of given length in string.

Here is source code of the C Program to Find all possible subsets of given length in string. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C Program to Find All Possible Subsets of given Length in String

```
 */
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```
#include <stdio.h>
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```
#include <string.h>
```
```
 
```
```
char a[20];
```
```
int n, len, j;
```
```
 
```
```
void main()
```
```
{
```
```
    int i, index = 0, start = 0;
```
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```
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    printf("Enter the string\n");
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    scanf("%s", a);
```
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    n = strlen(a);
```
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    printf("enter input length\n");
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    scanf("%d", &len);
```
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    printf("The subsets are\n");
```
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    for (i  =  1;i < = n;i++)
```
```
    {
```
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        if (index - start + 1  ==   i)
```
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        {
```
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            if (i  ==   len)
```
```
            {
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                for (j  =  index;j < n;j++)

```
                {
```

                    for (i  =  start;i < index;i++)

                        printf("%c", a[i]);

                    printf("%c\n", a[j]);

```
                }
```
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                if (start != i)
```
```
                {
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                    start++;
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                    index = start;
```
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                }
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            }
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            else
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            {
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                index++;
```
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            }
```
```
        }
```
```
    }
```
```
}
```

$ cc string20.c
$ a.out
Enter the string
programming
enter input length
2
The subsets are
pr
po
pg
pr
pa
pm
pm
pi
pn
pg
enter the string
programming
enter input length
4
The subsets are
prog
pror
proa
prom
prom
proi
pron
prog

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