IO

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getline按行读取内容(C++)

•功能：–从输入流中读入字符，存到string变量–直到出现以下情况为止：•读入了文件结束标志•读到一个新行•达到字符串的最大长度–如果getline没有读入字符，将返回false，可用于判断文件是否结束#include<stdio.h>#include<string.h>#define INFO_MAX_SZ 255#include <fstream>#include <string>#include <iostream>using namespace std;void readLine(){    ifstream f("t.txt", ios::in);    string buff;    while(getline(f, buff))        cout << buff << endl;}int main(){    readLine();    return 0;}

fgets读取行(C)

#include<stdio.h>#include<string.h>#define INFO_MAX_SZ 255#include <fstream>#include <string>#include <iostream>using namespace std;void fgetsLine(){    FILE* f = fopen("t.txt", "r");    if(f == NULL)        cout << "打开文件失败" << endl;    char ch[1024];    while(fgets(ch, 1024, f))    {        cout<< ch;    }}int main(){    fgetsLine();    return 0;}

按字段读取(C++)

#include<stdio.h>#include<string.h>#define INFO_MAX_SZ 255#include <fstream>#include <string>#include <iostream>using namespace std;void reader(){    ifstream f("t.txt", ios::in);    if(!f.is_open())        cout << "文件打开失败" << endl;    while(f != NULL)    {        string ch;        f >> ch;        if(ch == "")            break;        cout << ch << endl;    }}int main(){    reader();    return 0;}

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