原创 C语言typedef深入学习

typedef 一般形式为:

             typedef  原类型名  新定义名;

             typedef int INTECER;

             typedef float REAL;

           并用新定义的类型标识符去说明变量:

            INTEGER I,j;

            REAL a;

          它们等价于:

            int i, j;

            flaot  a;

            类型定义的使用

            1.定义数组类型

               typedef char STR[20];

               STR s1,s2;

               等价于:

              char s1[20],s2[20];

            2.定义指针类型

                typedef char  *STR;

                STR point,p[3];

                等价于:

                char *point,*p[3];

            3.定义函数类型

                typedef int(*POINT)();

                POINT p1;

                等价于:

                 int(*p)();

            4.定义结构类型:

               typedef struct

             {

                  char name[20];

                  char sex;

                  int   age;

                  long number;

             }STU;

      STU   stu_1;

         等价于:

               struct

               {

                char    name[20];

                char    sex;

                 int     age;

                long    number;

               }stu_1;

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