C Program to Count the Number of all Repeated Words in a String & Display the Word with its Frequency

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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.

  1. /*
  2.  * C Program to Count the Number of all Repeated Words
  3.  * in a String & Display the Word with its Frequency
  4.  */
  5. #include <stdio.h>
  6. #include <string.h>
  7. #include <ctype.h>
  8.  
  9. struct detail
  10. {
  11.     char word[20];
  12.     int freq;
  13. };
  14.  
  15. int update(struct detail [], const char [], int);
  16.  
  17. int main()
  18. {
  19.     struct detail s[10];
  20.     char string[100], unit[20], c;
  21.     int i = 0, freq = 0, j = 0, count = 0, num = 0;
  22.  
  23.     for (i = 0; i < 10; i++)
  24.     {
  25.        s[i].freq = 0;
  26.     }
  27.     printf("Enter string: ");
  28.     i = 0;
  29.     do
  30.     {
  31.         fflush(stdin);
  32.         c = getchar();
  33.         string[i++] = c;
  34.  
  35.     } while (c != '\n');
  36.     string[i - 1] = '\0';
  37.     printf("The string entered is: %s\n", string);
  38.     for (i = 0; i < strlen(string); i++)
  39.     {
  40.         while (i < strlen(string) && string[i] != ' ' && isalnum(string[i]))
  41.         {
  42.             unit[j++] = string[i++];
  43.         }
  44.         if (j != 0)
  45.         {
  46.             unit[j] = '\0';
  47.             count = update(s, unit, count);
  48.             j = 0;
  49.         }
  50.     }
  51.  
  52.     printf("*****************\nWord\tFrequency\n*****************\n");
  53.     for (i = 0; i < count; i++)
  54.     {
  55.         printf("%s\t   %d\n", s[i].word, s[i].freq);
  56.         if (s[i].freq > 1)
  57.         {
  58.             num++;
  59.         }
  60.     }
  61.     printf("The number of repeated words are %d.\n", num);
  62.  
  63.     return 0;
  64. }
  65.  
  66. int update(struct detail s[], const char unit[], int count)
  67. {
  68.     int i;
  69.  
  70.     for (i = 0; i < count; i++)
  71.     {
  72.         if (strcmp(s[i].word, unit) == 0)
  73.         {
  74.             s[i].freq++;
  75.  
  76.             return count;
  77.         }
  78.     }
  79.     /*If control reaches here, it means no match found in struct*/
  80.     strcpy(s[count].word, unit);
  81.     s[count].freq++;
  82.  
  83.     /*count represents the number of fields updated in array s*/
  84.     return (count + 1);
  85. }

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$ 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.

Sanfoundry Global Education & Learning Series – 1000 C Programs.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn