#include <fstream>   
#include <string>  
#include <iostream>  
#include <sstream>   
using namespace std;   

int main()   
{    
    //開啟要輸入的檔案
    ofstream oFile;   
    oFile.open("1.csv", ios::out | ios::trunc);    // 這樣就很容易的輸出一個需要的excel 檔案  
    oFile << "姓名" << ","
 
 << "年齡" << "," << "班級" << "," << "班主任" << endl;   
    oFile << "張三" << "," << "22" << "," << "1" << "," << "JIM" << endl;   
    oFile << "李四" << "," << "23" << "," << "3" << ","
 
 << "TOM" << endl;   

    oFile.close();   

    //開啟要輸出的檔案 
    ifstream iFile("1.csv");  
    string s1,s2,s3,s4;

    while(getline(iFile,s1))
    {
        cout<<s1<<endl; 
        cout<<endl;
    }
    iFile.close();


//逐個提取以逗號分隔的詞
    ifstream inf;
    inf.open("1.csv"
 
, ifstream::in);
    const int cnt = 3;    //一行有3個逗號    
    int j = 0;
    size_t comma = 0;
    size_t comma2 = 0;

    while ( getline(inf,s2) )
    {

        comma = s2.find(',',0);
        cout<<s2.substr(0,comma).c_str()<<'\t';
        while (comma < s2.size() && j != cnt-1)
        {
            comma2 = s2.find(',',comma + 1);
            cout<<s2.substr(comma + 1,comma2-comma-1).c_str()<<'\t';
            ++j;
            comma = comma2;
        }
        cout<<endl;
        j = 0;
    }
    inf.close();
    return 0;  
}  

輸出結果：

寫的時候個欄位要用逗號分隔，用空格不行；讀的時候一次要讀一行