C:关于typedef和enum

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我刚开始学习C，我想我还没有完全理解typedef的使用。

考虑这段代码:

#include <stdio.h>

enum _season{spring=1, summer, autumn, winter} season;

int main()
{
    int val;
    printf(" enter the number of the season: ");
    scanf("%d", &val);

    season = val;

    switch (season) {
        case 1:
            printf("spring");
            break;
        case 2:
            printf("summer");
            break;
        case 3:
            printf("autumn");
            break;
        case 4:
            printf("winter");
            break;
        default:
            printf("the seasons are only 4");
    }
    return 0;
}

无需 typedef 即可工作。我见过一些使用 typedef 的例子，有些则没有使用它，所以现在我有点困惑，我不明白什么时候应该使用 typedef，什么时候不应该？

您能给我快速解释一下吗？

感谢您的回答

Answer 1

typedef 有多种用途。引用几句

1) typedefs can be used to make programs easy to port. If typedefs are used for data types that may be machine-independent, onle the typedefs need to be changed when the program is moved.

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2) It can be used to provide better documentation for a program. A type called Treeptr may be easier to understand then one declared only as a pointer to a complicated structure.

来源:The C programming Language