C program to print all possible subsets of a given length in string

Here, we are going to learn how to print all possible subsets of a given length in string in C programming language?
Submitted by Nidhi, on July 20, 2021

Problem Solution:

Read a string from the user and find all possible subsets of a given length in the string using C program.

Program:

The source code to print all possible subsets of a given length in the string is given below. The given program is compiled and executed using GCC compile on UBUNTU 18.04 OS successfully.

```// C program to print all possible subsets
// of a given length in string

#include <stdio.h>
#include <string.h>

int main()
{
char str[32];

int i = 0;
int j = 0;
int l1 = 0;
int l2 = 0;

int ind = 0;
int start = 0;

printf("Enter string: ");
scanf("%s", str);

l1 = strlen(str);

printf("Enter length: ");
scanf("%d", &l2);

printf("The possible subsets are:\n");

for (i = 1; i <= l1; i++) {
if (ind - start + 1 == i) {
if (i == l2) {
for (j = ind; j < l1; j++) {
for (i = start; i < ind; i++)
printf("%c", str[i]);
printf("%c\n", str[j]);
}

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

return 0;
}
```

Output:

```RUN 1:
Enter string: IncludeHelp
Enter length: 3
The possible subsets are:
Inc
Inl
Inu
Ind
Ine
InH
Ine
Inl
Inp

RUN 2:
Enter string: Hello
Enter length: 2
The possible subsets are:
He
Hl
Hl
Ho
```

Explanation:

In the main() function, we read a string and length from the user and find all possible subsets of input length and printed the result on the console screen.

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