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output the letters of the alphabet with the number of occurrences

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# 1  
Old 12-02-2007
output the letters of the alphabet with the number of occurrences

I'm trying to create a program that will read a file and then check the file for each letter of the alphabet and then output the letter and the number of times it appears in the file, into a new file... this is what i have so far but it's not working.. if anyone could help that would be nice!

#include <iostream>
#include <fstream>
#include <string>
#include <cassert>
#include <cstring>
#include <cmath>
#include <vector>
using namespace std;

int main()
cout << "\n To find the number of occurrences of each letter in the alphabet in a specific file,"
<< "enter the file name:";
string inFile;
cin >> inFile;

cout << "\nEnter the name of the output file:";
string outFile;
cin >> outFile;

ifstream fin(;
assert (fin.is_open());
ofstream fout(;
assert (fout.is_open());

vector<int> numoccurrences(26);
int i;
char letter;
fin >> letter;
char lowercase = tolower(letter);
if ('a'<= lowercase <='z')
numoccurrences[ lowercase - 'a']++;
char ch = 0;
for (int i = 1; i < numoccurrences.size(); i++)
fout << ch << numoccurrences[i];
# 2  
Old 12-02-2007
moved to a more appropriate forum - 'High Level Programming'
# 3  
Old 12-02-2007
i really need some help with this.. if anyone has any ideas at all please post
# 4  
Old 12-02-2007
Is this one of those homework questions?
# 5  
Old 12-02-2007
it is for homework, but i dont want people to give me the answer, just a clue about where it's messing up, because i have no clue
# 6  
Old 12-02-2007
I like the use of C++ to make a simple problem more convoluted.

#include <stdio.h>

int main(int argc,char **argv) {
static int occur[256];
int i=' '; 

	while (1) {
		int c=getchar();
		if (c==EOF) break;
		occur[(unsigned char)c]++;

	while (i < 127) {
		if (occur[i]) printf("%c: %d\n",i,occur[i]);

	return 0;

Last edited by porter; 12-02-2007 at 07:36 PM..
# 7  
Old 12-02-2007
i'm not really sure what alot of that stuff means.. i'm new to C++... i don't know what arcg and **argv mean.. also is this just for a paragraph of 256 letters? and why do you assign int i = 32? and i also dont know what return 0 does...

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