Histogram of the frequencies of characters - C Program

Submitted by davidwachira on Thursday, August 8, 2013 - 23:54.
Language
C/C++
A program written in C to print a histogram of the frequencies of different characters (printable) in its input as horizontal bars
  1.  #include<stdio.h> /* C Standard Input and Output Library*/
  2.  
  3. /*Variable declarations*/
  4. char string_of_characters[200];
  5. int character_frequency_counter;
  6. int counter;
  7. int print_histogram_counter;
  8. int output_counter;
  9. char frequency_array[26][2]={'a',0,'b',0,'c',0,'d',0,'e',0,'f',0,'g',0,'h',0,'i',0,'j',0,'k',0,'l',0,'m',0,'n',0,'o',0,'p',0,'q',0,'r',0,'s',0,'t',0,'u',0,'v',0,'w',0,'x',0,'y',0,'z',0};
  10.  
  11.  
  12.  
  13. /*Functions declaration - prototyping*/
  14. char frequency_of_characters (char string_of_characters[50]);
  15. int printout_of_character_frequencies(char frequency_array[25][2]);
  16.  
  17. int main(void)/* The main method*/
  18. {   /* Brief detail on the screen about the program*/
  19.     printf(" /*************************************************************************\n *                   Mureithi David Wachira                               *\n *                   P15/2204/2011                                        *\n *                                                                        *\n *                   University of Nairobi                                *\n *                   School of Computing & Informatics                    *\n *                                                                        *\n *                   Course: PROGRAMMING AND PROBLEM SOLVING  (CSC 121)   *\n *                   Date:   Thursday 11th April 2013                     *\n *                                                                        *\n *                   A program to print a histogram of the                  *\n *              frequencies of different characters (printable)      *\n *              in its input (draw horizontal bars)                  *\n *                                                                        *\n *************************************************************************/\n");
  20.  
  21.     printf("Please enter a string of characters \n");   /* Prompt to instruct use to enter a string of characters*/
  22.     gets(string_of_characters);                         /* Capture of the string by the system using function gets()*/
  23.  
  24.     frequency_of_characters (string_of_characters);     /* Call of function frequency_of_characters()*/
  25.     printout_of_character_frequencies(frequency_array); /* Call of function printout_of_character_frequencies()*/
  26.  
  27.  
  28.     return 0;                                           /* An indication that the program runs successfully*/
  29. }                                                       /* The end of the main method*/
  30.  
  31.  
  32.  
  33. char frequency_of_characters (char string_of_characters[50])/* Function to calculate the frequencies of the characters and storage of the results in an array*/
  34. {
  35.     for(counter=0; counter<=strlen(string_of_characters); counter++) /* Loop to go through the array of characters (string) */
  36.     {
  37.           for (character_frequency_counter=0;character_frequency_counter<=25;character_frequency_counter++) /* Loop to go through the frequency array*/
  38.             {
  39.                if (frequency_array[character_frequency_counter][0]==string_of_characters[counter]) /* Comparability of a character to characters in the string*/
  40.                 {
  41.                  frequency_array[character_frequency_counter][1]=(frequency_array[character_frequency_counter][1])+1;/* If character if found its count is incremented by one(1)*/
  42.                 }
  43.             }
  44.  
  45.     }
  46.  
  47.     return frequency_array;   /* The function returns an array to the main method (caller)*/
  48.  
  49. }
  50.  
  51.  
  52. int printout_of_character_frequencies(char frequency_array[25][2]) /* Function to print out the results*/
  53. {
  54.     printf("\n\n%-10s%-8s%15s\n","Letter","Frequency","Histogram");
  55.         for(output_counter=0;output_counter<=25;output_counter++)  /* Loop to print the elements of the frequency array*/
  56.         {
  57.          printf("%3c%12d             ", frequency_array[output_counter][0], frequency_array[output_counter][1]);
  58.  
  59.         for (print_histogram_counter= 1; print_histogram_counter<= frequency_array[output_counter][1]; print_histogram_counter++ ) /* Loop to print the horizontal bars of the histogram*/
  60.         { printf( "%c",'*'); }
  61.  
  62.      printf("\n");          /* Next line*/
  63.         }
  64.         return 0;               /* Ends after the function executes successfully*/
  65. }
  66.  
  67.  
  68.  
  69. <c>

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Tags
histogram of characters
c program to draw histogram
histogram in C

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