Question

我想读取以下文件：以c开头的行代表注释，p代表图形信息（没有节点，没有边缘），e代表边缘。

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我对这是如何工作的想法是：

逐行读取，直到行c //Comments c //Comments c //Comments p edge 50 654 e 4 1 e 5 3 e 5 4 e 6 2 e 6 3 ... // 654 edges
将我的矩阵初始化为节点大小，此处为50。
阅读== 'p'; - 行数，将它们保存到我的数据结构中（在示例中为654行）。

我知道如何在Python中完成这项工作，但是我不知道从哪里开始使用c ++。

Answer 1

您可以尝试这样做：

ifstream file("myfile.txt");
string line;
while(true){
    getline(file, line);
    if(line[0]=='p') break;
 }
//now line contains a line starting with 'p' which contains the numbers
//that you need
stringstream data_from_line_with_p;
data_from_line_with_p << line;
//we have send the line to a stream, from which we can read to the variables
string p, edges;
int size_of_nodes, amount_of_edges;
//let's now assign these variables with data from the stream:
data_from_line_with_p >> p >> edges >> size_of_nodes >> amount_of_edges;

//now size_of_nodes and _amount_of_edges store the values read from this
//line and you can use them to build the structure that you want
//You also store here the word after 'p' in the variable 'edge' and you 
//can use it also if you need.

请务必添加标头以使用字符串流：#include<sstream>。

文件输入/输出C ++

1 个答案: