C Program to Print all the Repeated Numbers with Frequency in an Array

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This C Program print all the repeated numbers with frequency in an array.

Here is source code of the C Program to print all the repeated numbers with frequency in an array. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

  1. /*
  2.  * C Program to Print all the Repeated Numbers with Frequency in an Array
  3.  */
  4. #include <stdio.h>
  5. #include <malloc.h>
  6.  
  7. void duplicate(int array[], int num)
  8. {
  9.     int *count = (int *)calloc(sizeof(int), (num - 2));
  10.     int i;
  11.  
  12.     printf("duplicate elements present in the given array are ");
  13.     for (i = 0; i < num; i++)
  14.     {
  15.         if (count[array[i]] == 1)
  16.             printf(" %d ", array[i]);
  17.         else
  18.             count[array[i]]++;
  19.     }
  20. }
  21.  
  22. int main()
  23. {
  24.     int array[] = {5, 10, 10, 2, 1, 4, 2};
  25.     int array_freq = sizeof(array) / sizeof(array[0]);
  26.     duplicate(array, array_freq);
  27.     getchar();
  28.     return 0;
  29. }

$ cc pgm71.c
$ a.out
 duplicate elements present in the given array are  10  2

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If you wish to look at other example programs on Arrays, go to C Programming Examples on Arrays. If you wish to look at programming examples on all topics, go to C Programming Examples.
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