读取文本 添加行数并输出

three_write.PNG

#include<iostream>
#include<fstream>
#include<string>
#include<vector>
#include<stdlib.h>
using namespace std;

vector<string>saveText;                                 //vector 数组存储从文本读取的行数据

void readFile(string fileName) {
    ifstream infile;
    infile.open(fileName.data());
    string tempStr;                                     //临时存储用字符串
    int lineCnt=1;                                      //行统计
    while(getline(infile,tempStr)) {
        cout<<"第"<<lineCnt<<"行："<<tempStr<<endl;        //输出读取文本行 
        char lineCntChar[50];                                   
        itoa(lineCnt,lineCntChar,50);
        string str = lineCntChar;
        string tempSave =str+" "+tempStr;               //增加行标记 
        saveText.push_back(tempSave);                   //加入存储数组 
        lineCnt++;
    }
    infile.close();                                     //关闭文件流 
}

void writeFile(string fileName){
    ofstream ofile;
    ofile.open(fileName.data());
    for(int i=0;i<saveText.size();i++){
        ofile<<saveText[i]<<endl;
    }
    ofile.close();
}
int main() {
    cout<<"READ FILE"<<endl; 
    string readFileName = "fileRead.txt";
    readFile(readFileName); 
    cout<<"[Complete]READ FILE"<<endl; 
    cout<<"WRITE FILE"<<endl; 
    string writeFileName = "fileWrite.txt";
    writeFile(writeFileName);
    cout<<"[Complete]WRITE FILE"<<endl; 
    return 0;
}

1、逐行读入

void readTxtLine(string fileName)
{
    ifstream infile;
    infile.open(fileName.data()); //关联文件流对象与文件
    string s;
    while (getline(infile, s)) //逐行读取
    {
        cout << s << endl;
    }
    infile.close();
}

2、字符输入 忽略空格回车

void readTxtChar(string fileName)
{
    ifstream infile;
    infile.open(fileName.data());
    char c;
    while (!infile.eof())
    {
        infile >> c;        
        cout << c <<" ";
    }
    cout<<endl;
    infile.close();
}

字符读入 包含空格回车

void readTextCharNoskipws(string fileName){
    ifstream infile;
    infile.open(fileName.data());

    char c;
    infile >> noskipws;
    //no skip white space 不忽略任何地方的空格
    while(!infile.eof()){
        infile>>c;
        cout<<c;
    }
    cout<<endl;
    infile.close();

}