C++ fstream 用法

#include 
#include 

main()
{
    int a,b,c,d;
    std::ifstream infile ("test.txt", std::ifstream::in);

    while (!infile.eof())
    {
        infile >> a;
        infile >> b;
        infile >> c;
        infile >> d;
    }
    std::cout << a << std::endl;
}

text.txt

 1 2   6                     5

• 数字以空格(数量不限)分隔即可
• 每运行一次infile >>, 读取位置跑到下一个数字