Question

将C程序写入

计算安大略省一系列湖滩的大肠杆菌的平均水平
决定开放或关闭海滩
为数据文件中包含的所有湖泊和海滩生成报告。

对于每个海滩，文件中有一行数据，下面的字段用空格分隔 - 湖泊ID（整数），海滩编号（整数），采样数（整数）和一个实数（双）取样代表100毫升水中的生物数量。

湖桌

1: Ontario        
2: Erie    
3: Huron       
4: Muskoka   
5: Simcoe

海滩桌

100: Kew Beach       
101: Sunnyside Beach  
103: Sandbanks   
201: Port Dover  
202: Port Burwell  
203: Crystal Beach   
301: Goderich  
302: Sauble Beach    
303: Kincardine   
401: Muskoka Beach   
501: Sibbald Point

这是文件数据：

1 100 12 47.7 52.2 45.5 78.7 45.5 33.2 50.4 60.2 48.9 43.3 49.9 50.6     
1 101 9 75.5 53.2 65.1 81.1 44.1 42.2 41.1 39.7 51.1      
2 201 3 56.6 49.7 45.5     
2 202 2 44.4 66.6          
5 501 4 55.5 34.4 66.6 22.2     
4 401 4 33.3 44.4 55.5 66.6        
3 301 3 50.0 51.1 49.8       
3 302 4 77.7 66.6 22.2 33.3      
3 303 3 55.5 55.5 44.0      
1 103 1 13.3

我知道如何编写代码，但是我不知道的是如何使程序读取文件以及如何指定该特定数字是安大略湖，或者如何让程序对样本进行平均，我第一次参加编程只有2个月，所以请耐心等待。

Answer 1

您可以在文件中编写块结构，以二进制文件保存数据。

用于创建结构

struct Lake_table {
    int id;
    char name[length];
};

struct Beach_table {
    int samplings;
    char name[length]
    double samplings_ml;

};

使用那样的数据初始化结构！

struct Lake_table lakes[] =  {
{1,"Ontario"}
{2,"Erie"}
{3,"Huron"}
{4,"Muskoka"}
{5,"Simcoe"}
};

struct Beach_table beaches[] = {
{100,"Kew Beach",0.0}
{101,"Sunnyside Beach",0.0}
{103,"Sandbanks",0.0}
{201,"Port Dover",0.0}
{202,"Port Burwell",0.0}
{203,"Crystal Beach",0.0}
{301,"Goderich",0.0}
{302,"Sauble Beach",0.0}
{303,"Kincardine",0.0}
{401,"Muskoka Beach",0.0}
{501,"Sibbald Point",0.0}
};

要保存结构，请执行此操作！

FILE *file;
const char file_name[] =  "filename.dat";
file = fopen(file_name,"wb");
if (file != EOF) {
    fwrite(beaches,sizeof(struct Beach_table),length,file);

}

让你的结构做到这一点！

struct Beach_table beaches;
FILE *file;
    const char file_name[] =  "filename.dat";
    file = fopen(file_name,"rb");
    if (file != EOF) {
        fread(beaches,sizeof(struct Beach_table),length,file);
    }

要访问数据，概念与数组，指针相同。祝你好运

如何从文件中读取数字并将它们分配给它们实际意味着什么

1 个答案: