Statistics on the frequency of English characters, histogram output

Problem

Statistics on the frequency of the English characters in the specified file are not case-sensitive (both in uppercase statistics), and non-letters are ignored. And the frequency histogram is used to display it.

Source

Bar Friends Questions

Code

#include <iostream>#include<cctype>#include<cstdio>#include<cassert>using namespacestd;classLettercount {Private:        enum{letters_sum= -};//constants: 26 Letters in English            stringFile_path;//file path        intTotal_letters;//The total number of letters to be counted        intLetter_count[letters_sum];//save occurrences of each word        DoubleLetter_frequence[letters_sum];//Save the frequency of occurrences of each word//not allowed to useLettercount (Constlettercount& le);//copy functionlettercount&operator=(Constlettercount& le);//Assignment Function                          Public:        voidSetFilePath (Const Char*path) {file_path = path;}//set the path of a file inline function    voidAnalyse ();//Statistical Functions    voidShowgraph ()Const;//Print a chartLettercount (); Lettercount (Const Char*path); ~Lettercount (); }; Lettercount::lettercount (): File_path (), Total_letters (0){     for(intI=0; i<letters_sum;++i) {Letter_count[i]=0; Letter_frequence[i]=0.0; }}lettercount::lettercount (Const Char*path): File_path (Path), Total_letters (0){     for(intI=0; i<letters_sum;++i) {Letter_count[i]=0; Letter_frequence[i]=0.0; }}lettercount::~Lettercount () {// do nothing}voidLettercount::analyse () {FILE*FP = fopen (File_path.c_str (),"R");//Open FileASSERT (fp!=NULL); Charch;  while((CH=FGETC (fp))! =EOF) {        if(Isalpha (CH))//if it is not an English letter, ignore{//Ignore case, all uppercase statisticsletter_count[toupper (CH)-'A']++; Total_letters++; }} fclose (FP); //Close File//Calculate the frequency of a word     for(intI=0; i<letters_sum;++i) {Letter_frequence[i]= (letter_count[i]*1.0)/total_letters; }     }          voidLettercount::showgraph ()Const{        /**************** Sample Map 100| *               | * *               | * * * 0 |-----------A B C ... *********************/             for(intR= -; r!=0;--r)//the chart has 100 lines representing the hundred percent    {            if(r%Ten==0)//prints the integer percentage of the table for easy observation.printf"%-3d", R); Elseprintf ("   "); printf ("|");  for(CharCh='A'; ch<='Z';++ch) {            if(int(((letter_frequence[ch-'A']* -) +0.5)) >=r) {printf (" *"); }            Else{printf ("  "); } printf (" "); } printf ("\ n"); } printf ("%-3d",0);  for(CharCh='A'; ch<='Z';++ch) {printf ("----"); } printf ("\ n");p rintf ("%-3c",' ');  for(CharCh='A'; ch<='Z';++ch) {printf ("%c", CH); } printf ("\ n");}intMain () {lettercount LC ("G:\\data.txt");        Lc.analyse ();            Lc.showgraph (); return 0;}

Effect

Statistics on the frequency of English characters, histogram output