这个程序是读入一个文本，然后输出该文本，并且打印文本中行的数目以及每一个字母出现的次数（不分大小写）因为刚开始用VC，提示都看不懂，求达人不吝赐教
//Program: Line and letter count
#include <iostream>
#include <fstream>
#include <cctype>
using namespace std;
void initialize(int& lc,int list[]);
void copyText(ifstream& intext,ofstream&,outtext,char& ch,int list[]);
void characterCount(char ch,int list[]);
void writeTotal(ofstream& outtext,int lc,int list[]);
int list[26];
int main()
{
    //Step 1;Declare variables
int lineCount;
int letterCount[26];
char ch;
ifstream infile;
ofstream outfile;
infile.open("e:a.txt");
if(!infile)
{
  cout<<"Cannot open  input file."<<endl;
  return 1;
}
outfile.open("e:b.txt");
initialize(lineCount,letterCount);
infile.get(ch);
while(infile)
{
    copyText(infile,outfile,ch,letterCount);
    lineCount++;
    infile.get(ch);
}
writeTotal(outfile,lineCount,ch,letterCount);
infile.close();
outfile.close();
return 0;
}
void initialize(int& lc,int list[])
{
    int j;
    lc=0;
    for(j=0;j<26;j++)
        list[j]=0;
}
void copyText(ifstream& intext,ofstream& outtext,char& ch,int list[])
{
    while(ch!='\n') //Process the entire line
    {
        outtext<<ch;//Output the character
        characterCount(ch,list);
        intext.get(ch);//Read the next character
    }outtext<<ch;//Output the newline character
}
void characterCout(char ch,int list[])
{
    int index;
    ch=toupper(ch);
    index=static_cast<int>(ch-65);//Step b
    if(0<=index&&index>=26)//Step c
        list[index]++;
}
void writeTotal(ofstream& outtext,int lc,int list[])
{
    int index;
    outtext<<endl<<endl;
    outtext<<"The number of lines="<<lc<<endl;
    for(index=0;index<26;index++)
        outtext<<static_cast<char>(index+65)<<"count="
        <<list[index]<<endl;
}

只可惜我不是高人  我楼下的帮你解决