阅读在C文件 [英] Reading a file in C

问题描述

我的朋友和我工作的一个项目，我们需要从在C文件中读取输入。

My friend and I are working on a project, and we need to read input from a file in C.

文件看起来是这样的：

15 25 200
3 10
17.99 22.99 109.99
100 2 4
5.99 99.99 20.00 49.99
10 10 10 10 10 10 10 10 10 10
3.99 5.99 7.99 8.00 5.00 5.00 5.00 6.00 7.00 9.99
5

我需要读取线的文件中的行，并设定为等于一个不同的变量的每个值。例如，在第一行中的第一个值必须设置为变量preSalePrices，第二值doorPrices和第三preSales。我需要帮助搞清楚如何指定每行的值的数量。例如，我怎么告诉程序在第一行拿到三个值，但只有两个在第二行？然后在第五行四个值，并依此类推。

I need to read the file line by line, and set each value equal to a different variable. For example, the first value on the first line must be set to the variable preSalePrices, the second value doorPrices, and the third preSales. I need help figuring out how to specify the number of values on each line. For example, how do I tell the program to get three values on the first line, but only two on the second line? Then four values on the fifth line, and so on.

下面是我的code，但它只是崩溃了：

Here is my code, but it just crashes:

int main() {
    float preSalePrices, doorPrices;
    int preSales;
    FILE *fp;
    fp = ("C://Users//Jake//Desktop//Charity Ball//auction01.txt", "r");

    while(fscanf(fp, "%f %f %i", &preSalePrices, &doorPrices, &preSales) != EOF) {
        printf("%f, %f, %i", preSalePrices, doorPrices, preSales);               
    } 
}

我看了所有在互联网上，我无法找到与此相关的任何具体的。

I've looked all over the internet and I can't find anything related to this specifically.

推荐答案

如果你总是知道值的每一行的数量，你可以忽略尾线和读出的值一个接一个。

If you always know the number of values in each line, you can just ignore the end-of-lines and read the values one by one.

如果最终的线是重要的最简单的方法是分别读取每一行（如与fgets ），然后从那里读取数据，并用的sscanf 。

If the end-of-lines are important the easiest way is to read each line separately (e.g. fgets) and then read the data from there, with sscanf.

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