如何从txt读取数据到数组 [英] how to read data from txt to an array

问题描述

这是datafile.txt中的数据，
线:30，
num0 = 1
num1 = 3
num2 = 2
...
num29 = 5

我想将num0的值导入到num29到array [29]，我要怎么实现，谢谢！！

this is the data in datafile.txt,
line:30,
num0=1
num1=3
num2=2
...
num29=5

I want to import the value of num0 to num29 to array[29],how can I realize this，thank you ！

推荐答案

您可以使用sscanf进行如下操作.但是您应该知道每一行的格式.在这里，我们假设行要么被格式化为
"line:30""
或
num0 = 1
所以我们将代码编写如下

You can do this using sscanf as below. But you should know the format of each line. here we assume that lines either get formatted like
"line:30,"
or
num0=1
so we write our code as below

CString csLine; // csLine has each line text
int c, d;
if( !sscanf( csLine, "num%d=%d", &c, &d ) // c will have 0 and d will have 1 incase of num0=1
{
    if( !sscabf( csLine, "line:%d", &c ) // c will have 30 incase of "line:30"
    {
        // Some incorrect/unexpected format for the line
    }
}

希望您有主意

hope you got the idea

首先，您需要了解如何读取文件.请参阅:
C ++样式: http://www.cplusplus.com/doc/tutorial/files/ [ ^ ];
C样式: http://www.cplusplus.com/forum/beginner/32690/ [ ^ ].

您还可以使用Resmi Anna演示的sscanf:
http://www.cplusplus.com/reference/clibrary/cstdio/scanf/ [ ^ ].

—SA

First, you need to know how to read files. Please see:
C++ style: http://www.cplusplus.com/doc/tutorial/files/[^];
C style: http://www.cplusplus.com/forum/beginner/32690/[^].

You can also use the sscanf as demonstrated by Resmi Anna:
http://www.cplusplus.com/reference/clibrary/cstdio/scanf/[^].

—SA

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