I/O C++从文本文件中读取

发布于 2024-12-05 14:41:01 字数 639 浏览 0 评论 0原文

在我的程序中，我输入一个文件，文件内部如下所示：

11267 2 500.00 2.00

...这是一行。还有更多线路按相同顺序设置。我需要将第一个数字 11267 输入到 actnum 中。之后，2 进入 choice 等。我只是缺乏逻辑来弄清楚如何将前 5 个数字输入到第一个变量中。

actnum = 11267;
choice = 2;

编辑*

我拥有所有这些：

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



void main()
{
    int trans = 0, account;
    float ammount, bal;

    cout << "ATM" << endl;

等等等等

我只是不知道如何让它只输入特定的数字。就像我执行 >>actnum >> 时一样choice 它怎么知道只将前 5 个数字放入其中？

原文

In my program I'm inputting a file and inside the file is something like this:

11267 2 500.00 2.00

...that is one line. There are more lines set up in that same order. I need to input the first number, 11267, into actnum. After that, 2 into choice, etc. I simply lack the logic to figure out how to input just the first 5 numbers into the first variable.

actnum = 11267;
choice = 2;

Edit*

I have all of that:

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



void main()
{
    int trans = 0, account;
    float ammount, bal;

    cout << "ATM" << endl;

etc etc

I just dont know how to get it to only input the specific numbers into it. Like when I do the >>actnum >> choice how does it know to put just the first 5 numbers in it?

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秋千易 2024-12-12 14:41:01

使用 C++ 库。 fscanf() 稍微过时了，您可能会从获得更好的性能，更不用说代码更容易阅读：

#include <fstream>
using namespace std;

ifstream fileInput("C:\foo.txt");
fileInput >> actnum >> choice >> float1 >> float2;

Use the C++ <fstream> library. fscanf() is slightly out of date and you will probably get better performance from <fstream>, not to mention that the code is a lot easier to read:

#include <fstream>
using namespace std;

ifstream fileInput("C:\foo.txt");
fileInput >> actnum >> choice >> float1 >> float2;

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度的依靠╰つ 2024-12-12 14:41:01

input_file_stream >> actnum >> choice >> ...

input_file_stream >> actnum >> choice >> ...

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爱她像谁 2024-12-12 14:41:01

fscanf 就是您正在寻找的东西。它的工作方式与 scanf 相同，但用于文件。

unsigned int actnum, choice;
float float1, float2;

FILE *pInputFile = fopen("input.txt", "r");

fscanf(pInputFile, "%u %u %f %f", &actnum, &choice, &float1, &float2);

fscanf is what you are looking for. it works the same as scanf, but is for files.

unsigned int actnum, choice;
float float1, float2;

FILE *pInputFile = fopen("input.txt", "r");

fscanf(pInputFile, "%u %u %f %f", &actnum, &choice, &float1, &float2);

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