如何从文本文件中读取特定数量的字符 [英] How to read a specific amount of characters from a text file

问题描述

我试着这样做

 #include <iostream>
 #include <fstream>

using namespace std;

int main()
{
    char b[2];
    ifstream f("prad.txt");
    f>>b ;
    cout <<b;
    return 0;
}

它应该读取2个字符，但它读取整行。

It should read 2 characters but it reads whole line. This worked on another language but doesn't work in C++ for some reason.

推荐答案

您可以使用 read（） 指定要读取的字符：

You can use read() to specify the number of characters to read:

char b[3] = "";
ifstream f("prad.txt");

f.read(b, sizeof(b) - 1); // Read one less that sizeof(b) to ensure null
cout << b;                // terminated for use with cout.

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