文件内容

2

3 2

1 4 1 1 0 11

4 1 1 1 8 11

2 5 0 0 0 11

4 1 0 0 0 11

5 5

2 4 1 0 1 13

4 4 0 1 12 13

1 4 1 1 0 13

3 5 1 1 7 13

一、格式读取

1. C语言

FILE * f_in = fopen("1.txt", "r");    int k;    int m, n;    int dp[6];    fscanf(f_in, "%d", &k);    while (k--) {        fscanf(f_in, "%d %d", &m, &n);        for (int i = 0; i < 4; ++i) {            fscanf(f_in, "%d %d %d %d %d %d", &dp[0], &dp[1], &dp[2], &dp[3], &dp[4], &dp[5]);        }    }

2. C++  >>输入运算符遇到空白字符就停止输入，但把空白字符留在缓冲区

ifstream f_in("1.txt");    int k;    int m, n;    int dp[6];    f_in >> k;    while (k--) {        f_in >> m >> n;        for (int i = 0; i < 4; ++i) {            f_in >> dp[0] >> dp[1] >> dp[2] >> dp[3] >> dp[4] >> dp[5];            cout << dp[0] << "," << dp[1] << "," << dp[2] << "," << dp[3] << "," << dp[4] << "," << dp[5] << endl;        }    }

 

二、读取一行

C++

getline一直读到换行符，从输入缓存读取换行符并把换行符丢弃

ifstream f_in("1.txt");        string str;        while (getline(f_in, str)){            cout << str << endl;    }

C语言 fgets读取并丢掉换行符

FILE* f_in = fopen("1.txt", "r");        char str[1024];    while (fgets(str, 1024, f_in)){        cout << str;    }