C Program to Count Number of Unique Words in a String

This C Program Counts the Number of Unique Words.

Here is source code of the C Program to Count the Number of Unique Words. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C Program to Count the Number of Unique Words

```
 */
```
```
#include <stdio.h> 
```
```
#include <string.h>
```
```
#include <stdlib.h>
```
```
int main()
```
```
{
```
```
    int i = 0, e, j, d, k, space = 0;
```
```
    char a[50], b[15][20], c[15][20];
```
```
 
```
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    printf("Read a string:\n");
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    fflush(stdin);
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    scanf("%[^\n]s", a);
```

    for (i = 0;a[i] != '\0';i++)        //loop to count no of words

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    {
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```
        if (a[i] =  = ' ')
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            space++;
```
```
    }
```
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    i = 0;
```

    for (j = 0;j<(space + 1);i++, j++)    //loop to store each word into an 2D array

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    {
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        k = 0;
```
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        while (a[i] != '\0')
```
```
        {
```
```
            if (a[i] == ' ')
```
```
            {
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                break;
```
```
            }
```
```
            else
```
```
            {
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```
                b[j][k++] = a[i];
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                i++;
```
```
            }
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```
        }
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        b[j][k] = '\0';
```
```
    }
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    i = 0;
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    strcpy(c[i], b[i]);
```

    for (e = 1;e <= j;e++)        //loop to check whether the string is already present in the 2D array or not

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    {
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        for (d = 0;d <= i;d++)
```
```
        {
```

            if (strcmp(c[i], b[e]) == 0)

```
                break;
```
```
            else
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```
            {
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                i++;
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                strcpy(c[i], b[e]);
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                break;
```
```
            }
```
```
        }
```
```
    }
```

    printf("\nNumber of unique words in %s are:%d", a, i);

```
    return 0;
```
```
}
```

$ cc string7.c
$ a.out
Read a string:
Welcome to Sanfoundry's C-programming class,  Welcome again to C class!
The length of input string is:70
 
Number of unique words in Welcome to Sanfoundry's C-programming class,  Welcome again to C class! are:8

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