HZD's Digital Garden

File, Structure and Dynamic Memory

1 min read

C_language

Tell It by Myself…

在我个人看来，这个内容和此前所学的各种 C 语言最大的区别是它新增了一些能够从程序之外的文件（如 txt，二进制的图片和音频）读取并且处理的能力，如 fopen 和，fclose 等

The declaration is:

FILE *fp

fp = fopen(“filename”, “mode”)

“r”—reading

“w”—writing

“r+”– open both for reading and writing, if file does not exist, returns NULL

“w+”— open both for reading and writing, if file does not exist, it will be created

fclose(fp) to close a file.

What is struct?

We already know that Array require all the elements are in the same datatype. However, it is necessary to group all the information of different data type. So we need a concept called Structure.

struct Person {
    int age;
    char name[30];
    float height;
};

This means we define a structure called ‘Person’ and the structure contains age, name and height.

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