Histogram of the frequencies of characters - C Program

#include<stdio.h> /* C Standard Input and Output Library*/
 
/*Variable declarations*/
char string_of_characters[200];
int character_frequency_counter;
int counter;
int print_histogram_counter;
int output_counter;
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};
 
 
 
/*Functions declaration - prototyping*/
char frequency_of_characters (char string_of_characters[50]);
int printout_of_character_frequencies(char frequency_array[25][2]);
 
int main(void)/* The main method*/
{/* Brief detail on the screen about the program*/
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");
 
printf("Please enter a string of characters \n");/* Prompt to instruct use to enter a string of characters*/
gets(string_of_characters);/* Capture of the string by the system using function gets()*/
 
    frequency_of_characters (string_of_characters);/* Call of function frequency_of_characters()*/
    printout_of_character_frequencies(frequency_array);/* Call of function printout_of_character_frequencies()*/
 
 
return0;/* An indication that the program runs successfully*/
}/* The end of the main method*/
 
 
 
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*/
{
for(counter=0; counter<=strlen(string_of_characters); counter++)/* Loop to go through the array of characters (string) */
{
for(character_frequency_counter=0;character_frequency_counter<=25;character_frequency_counter++)/* Loop to go through the frequency array*/
{
if(frequency_array[character_frequency_counter][0]==string_of_characters[counter])/* Comparability of a character to characters in the string*/
{
                 frequency_array[character_frequency_counter][1]=(frequency_array[character_frequency_counter][1])+1;/* If character if found its count is incremented by one(1)*/
}
}
 
}
 
return frequency_array;/* The function returns an array to the main method (caller)*/
 
}
 
 
int printout_of_character_frequencies(char frequency_array[25][2])/* Function to print out the results*/
{
printf("\n\n%-10s%-8s%15s\n","Letter","Frequency","Histogram");
for(output_counter=0;output_counter<=25;output_counter++)/* Loop to print the elements of the frequency array*/
{
printf("%3c%12d             ", frequency_array[output_counter][0], frequency_array[output_counter][1]);
 
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*/
{printf("%c",'*');}
 
printf("\n");/* Next line*/
}
return0;/* Ends after the function executes successfully*/
}
 
 
 
<c>