读写数据块函数--fread( )和fwrite( )函数

读写数据块函数--fread( )和fwrite( )函数
    调用方式分别为:
    (1)
、fread(buffer,size,count,fp); 该函数将fp指向的文件的数据以数据块的形式读入内存buffer
   
(2)、write(buffer,size,count,fp);该函数将内存buffer的内容以数据块的形式写入fp指向的文件。
   
其中:buffer:是一个指针。对于fread来说 它是读入数据的有效地址。对 fwrite来说,是要写盘的数据地址(起始地址)。
size:要读写的字节数。count:要进行读写多少个size字节的 数据项。 fp:文件型指针
如果fread或fwrite调用成功,则函数返回值为count的值。 若文件以二进制形式打开,用fread和fwrite函数就可以读写任何类型的信息。如:
fread(f,4,2,fp); f为实型数组名,4表示个实型变量占4个字节,2表示读入2次,fp向的文件数据。
   
例:从键盘输入4个学生的有关数据,然后把它们转存到磁盘文件上去。
    #include<stdio.h>
    #define
SIZE 4
    struct student_type
    {
    char name[10];
    int
num;
    int age;
    char addr[15];
    }stud[SIZE];
    void
save();/*保存输入数据到文件的函数声明*/
    void output();/*输入文件内容的函数声明*/
   
/*在主函数main( )中的终端读入4个学生的数据,然后调用save( )函数。*/

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时间: 2024-10-16 21:54:36

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