C Program to Count Repeated Words from a String

This C Program counts the number of all repeated words in a string and displays the repeated words with it’s frequency.

Here is a source code of the C program that counts the number of all repeated words in a string display the word with it’s frequency. 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 all Repeated Words

 * in a String & Display the Word with its Frequency

```
 */
```
```
#include <stdio.h>
```
```
#include <string.h>
```
```
#include <ctype.h>
```
```
 
```
```
struct detail
```
```
{
```
```
    char word[20];
```
```
    int freq;
```
```
};
```
```
 
```

int update(struct detail [], const char [], int);

```
 
```
```
int main()
```
```
{
```
```
    struct detail s[10];
```
```
    char string[100], unit[20], c;
```

    int i = 0, freq = 0, j = 0, count = 0, num = 0;

```
 
```
```
    for (i = 0; i < 10; i++)
```
```
    {
```
```
       s[i].freq = 0;
```
```
    }
```
```
    printf("Enter string: ");
```
```
    i = 0;
```
```
    do
```
```
    {
```
```
        fflush(stdin);
```
```
        c = getchar();
```
```
        string[i++] = c;
```
```
 
```
```
    } while (c != '\n');
```
```
    string[i - 1] = '\0';
```

    printf("The string entered is: %s\n", string);

    for (i = 0; i < strlen(string); i++)

```
    {
```

        while (i < strlen(string) && string[i] != ' ' && isalnum(string[i]))

```
        {
```
```
            unit[j++] = string[i++];
```
```
        }
```
```
        if (j != 0)
```
```
        {
```
```
            unit[j] = '\0';
```

            count = update(s, unit, count);

```
            j = 0;
```
```
        }
```
```
    }
```
```
 
```

    printf("*****************\nWord\tFrequency\n*****************\n");

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

        printf("%s\t   %d\n", s[i].word, s[i].freq);

```
        if (s[i].freq > 1)
```
```
        {
```
```
            num++;
```
```
        }
```
```
    }
```

    printf("The number of repeated words are %d.\n", num);

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

int update(struct detail s[], const char unit[], int count)

```
{
```
```
    int i;
```
```
 
```
```
    for (i = 0; i < count; i++)
```
```
    {
```

        if (strcmp(s[i].word, unit) == 0)

```
        {
```
```
            s[i].freq++;
```
```
 
```
```
            return count;
```
```
        }
```
```
    }
```

    /*If control reaches here, it means no match found in struct*/

```
    strcpy(s[count].word, unit);
```
```
    s[count].freq++;
```
```
 
```

    /*count represents the number of fields updated in array s*/

```
    return (count + 1);
```
```
}
```

$ cc wordfrequency.c
$ ./a.out
Enter string: hello world hello program hello C 
The string entered is: hello world hello program hello C 
*****************
Word	Frequency
*****************
hello	   3
world	   1
program	   1
C	   1
The number of repeated words are 1.

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