C Program to Check if Two Strings are Permutation of Each Other

This C Program determines if the two entered strings are circular permutation of another string. Eg: yzx is a circular permutation of xyz but not zyx.

Here is a source code of the C program to determine if the two entered string are a circular permutation of one another. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C Program to Determine if One String is a Circular Permutation of

```
 * Another String 
```
```
 */
```
```
#include <stdio.h>
```
```
#include <string.h>
```
```
#include <ctype.h>
```
```
#include <stdlib.h>
```
```
#define CHAR_SIZE 26
```
```
 
```
```
void alphacheck(char *, int []);
```
```
void create(char [], char [], int[]);
```
```
 
```
```
int main()
```
```
{
```
```
    char str1[50], str2[50];
```
```
    int a1[CHAR_SIZE] = {0};
```
```
    char str2_rem[50];
```
```
 
```
```
    printf("Enter string1: ");
```
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    scanf("%s", str1);
```
```
    printf("Enter string2: ");
```
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    scanf("%s", str2);
```
```
    alphacheck(str1, a1);
```
```
    create(str2_rem, str2, a1);
```

    printf("On removing characters from second string we get: %s\n", str2_rem);

```
 
```
```
    return 0;
```
```
}
```
```
 
```
```
void alphacheck(char *str, int a[])
```
```
{
```
```
    int i, index;
```
```
 
```
```
    for (i = 0; i < strlen(str); i++)
```
```
    {
```
```
        str[i] = tolower(str[i]);
```
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        index = str[i] - 'a';
```
```
        if (!a[index])
```
```
        {
```
```
            a[index] = 1;
```
```
        }
```
```
    }
```
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    printf("\n");
```
```
}
```
```
 
```

void create(char str_rem[], char str[], int list[])

```
{
```
```
    int i, j = 0, index;
```
```
 
```
```
    for (i = 0; i < strlen(str); i++)
```
```
    {
```
```
        index = str[i] - 'a';
```
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        if (!list[index])
```
```
        {
```
```
            str_rem[j++] = str[i];
```
```
        }
```
```
    }
```
```
    str_rem[j] = '\0';
```
```
}
```

$ gcc circularpermu.c 
$ ./a.out
Enter string 1: abcd
Enter string 2: dabc
abcd & dabc are circular permutation of each other.

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