c++统计文件中字符个数代码汇总
我们先来看看下面的代码：
#include<iostream>
#include<fstream>
#include<cstdlib>
usingnamespacestd;
classCntCharacters
{
private:
intcnt;
public:
CntCharacters():cnt(0){}
~CntCharacters(){}
voidopentxt(char*p)
{
ifstreamfin;
fin.open(p,ios_base::in);
if(!fin.is_open())
{
cout<<"cannotopenthefile,Pleasemakesurethefileisexist!\n";
exit(-1);
}
chartemp;
while(!fin.eof())
{
fin>>temp;
if((temp>='a'&&temp<='z')||(temp>='A'&&temp<='Z'))cnt++;
}
}
voidcountthecharacter()
{
intcount=0;
charnameoffile[80];
cout<<"Pleaseenterthenameoffile:";
cin>>nameoffile;
//scanf("%s",nameoffile);
opentxt(nameoffile);
}
voiddis()
{
cout<<cnt<<endl;
}
};
intmain()
{
CntCharacters*c=newCntCharacters;
c->countthecharacter();
c->dis();
deletec;
return0;
}
网上大神的简单代码
#include<iostream>
#include<fstream>
usingnamespacestd;
intmain()
{
fstreamf("test.txt",ios::in);
charc;
intn=0;
while(f.get(c))n++;
cout<<n<<endl;
f.close();
return0;
}
上面那方法会计算空格和换行，如果不想要换行和空格，可以这样:
#include<iostream>
#include<fstream>
usingnamespacestd;
intmain()
{
fstreamf("test.txt",ios::in);
charc;
intn=0;
while(f>>c)n++;
cout<<n<<endl;
f.close();
return0;
}
好了，最后来看一下项目中使用到的代码
//countch.cpp
#include<iostream>
#include<fstream>
#include<string>
usingnamespacestd;
intmain(intargc,char*argv[])
{
ifstreamfin(argv[1]);
if(!fin){
cout<<"Can'topenfile-"<<argv[1]
<<"\nUseage:countchfilename"<<endl;
return1;
}
stringd;
intcount=0;
while(getline(fin,d))//以行为单位读入文件
count+=d.size();//累计字符数
cout<<"\nNumberofcharacters:"<<count<<endl;
}