typedef关键字

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#include <stdio.h>void print1(int,int);void print2(int,int);/* typedef 用于给类型定义别名 typedef 原类型名称 别名 *///基本数据类型typedef int myInt;typedef myInt myInt2;//指针typedef char * String;//结构体/* 1. struct Student    {        String name;    };    typedef struct Student Stu; 2.typedef struct Student   {        String name;   } Stu; *///3.typedef struct{    String name;} Stu;//枚举/* 1.enum Sex   {        female,        male   };   typedef Sex Sex 2.typedef enum Sex   {        female,        male   }Sex; *///3.typedef enum{    female,    male}Sex;//指向函数的指针typedef void (*FunP) (int ,int);//指向结构体的指针typedef Stu * StuP1;typedef struct{    String name;} *StuP2;int main(){    myInt i=1;    myInt2 i2=2;    printf("i=%d, i2=%d\n",i,i2);    printf("------------------------------\n");    String a,b;    a="stra";    b="strb";    printf("a=%s, b=%s\n",a,b);    printf("------------------------------\n");    Stu s1,s2;    s1.name="s1";    s2.name="s2";    printf("s1.name=%s, s2.name=%s\n",s1.name,s2.name);    printf("------------------------------\n");    Sex sex1,sex2;    sex1=male;    sex2=female;    printf("sex1=%d, sex2=%d\n",sex1,sex2);    printf("------------------------------\n");    FunP p1,p2;    p1=print1;    p2=print2;    p1(1,2);    p2(1,2);    printf("------------------------------\n");    StuP1 sp1=&s1;    StuP2 sp2=&s2;    (*sp1).name="sp1";    sp2->name="sp2";    printf("sp1.name=%s, sp2.name=%s\n",sp1->name,(*sp2).name);    return 0;}void print1(int a,int b){    printf("a+b=%d\n",a+b);}void print2(int a,int b){    printf("a-b=%d\n",a-b);}

执行结果

i=1, i2=2------------------------------a=stra, b=strb------------------------------s1.name=s1, s2.name=s2------------------------------sex1=1, sex2=0------------------------------a+b=3a-b=-1------------------------------sp1.name=sp1, sp2.name=sp2

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