c++读取 轨迹.txt

仅做测试用！

按行读入

1. 只读取一行

/*************************************************************************
	> File Name: test.cpp
	> Author: lihanwen
	> Mail: 18646139976@163.com
	> Created Time: 二  4/28 10:32:05 2020
 ************************************************************************/

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <vector>
#include <map>
#include <cmath>
#include <deque>
#include <fstream>

using namespace std;

string input = "1.txt";

int main() {
    fstream fin(input);
    string a;
    getline(fin, a);
    cout << a << endl;
    return 0;
}

测试结果：

2. 按行读取整个txt

/*************************************************************************
	> File Name: test.cpp
	> Author: lihanwen
	> Mail: 18646139976@163.com
	> Created Time: 二  4/28 10:32:05 2020
 ************************************************************************/

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <vector>
#include <map>
#include <cmath>
#include <deque>
#include <fstream>

using namespace std;

string input = "1.txt";

int main() {
    fstream fin(input);
    string a;
    while (!fin.eof()) {
        getline(fin, a);
        cout << a << endl;
    }
    return 0;
}

或者是：

/*************************************************************************
	> File Name: test.cpp
	> Author: lihanwen
	> Mail: 18646139976@163.com
	> Created Time: 二  4/28 10:32:05 2020
 ************************************************************************/

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <vector>
#include <map>
#include <cmath>
#include <deque>
#include <fstream>

using namespace std;

string input = "1.txt";

int main() {
    fstream fin(input);
    string a;
    while (getline(fin, a)) {
        cout << a << endl;
    }
    return 0;
}

按字符串读入

注意：按字符读入时，如果遇到空格，并且没有循环的情况下，会自动停止。

/*************************************************************************
	> File Name: test.cpp
	> Author: lihanwen
	> Mail: 18646139976@163.com
	> Created Time: 二  4/28 10:32:05 2020
 ************************************************************************/

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <vector>
#include <map>
#include <cmath>
#include <deque>
#include <fstream>

using namespace std;

string input = "1.txt";

int main() {
    fstream fin(input);
    string a;
    fin >> a;
    cout << a << endl;
    return 0;
}

/*************************************************************************
	> File Name: test.cpp
	> Author: lihanwen
	> Mail: 18646139976@163.com
	> Created Time: 二  4/28 10:32:05 2020
 ************************************************************************/

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <vector>
#include <map>
#include <cmath>
#include <deque>
#include <fstream>

using namespace std;

string input = "1.txt";

int main() {
    fstream fin(input);
    string a;
    while (!fin.eof()) {
        fin >> a;
        cout << a << endl;
    }
    return 0;
}

如果是按字符读入，需要将输出为char类型即可

按字符读入，结果需要什么类型，输出类型就是什么

参考：

[c++读取txt][https://www.cnblogs.com/VVingerfly/p/4435898.html]