C语言之typedef的使用

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#include<stdio.h>int  getSum(int a, int b);/*_____________________________typedef的使用______________________________*///1.typedef的作用//int取个一个别名NSIntegertypedef int  NSInteger;//float取个一个别名WXFloattypedef float  WXFloat;//在别名的基础上再取别名typedef WXFloat MyFloat;//2.typedef和指针typedef char * string;//3.typedef和结构体//定义结构体类型struct Mypointstruct Mypoint {float x;float y;};//方式一：typedef struct Mypoint Point;//方式二：typedef struct Myp {float a;float b;}Py;//方式三typedef struct {float x;float y;}Po; //3.typedef和枚举//定义枚举类型enum Weatherenum Weather {sun,rainy,haze};//方式一：typedef enum Weather W;//方式二：typedef enum Wae {s,d,f} W1;//方式三：typedef enum {w,e,r} W2;//4.typedef和函数指针//给韩式指针取别名,注意：此处的MySum不是变量名，他是类型typedef int (*MySum)(int a, int b);int main() {//定义整型变量aNSInteger a = 20;printf("a:%d\n",a);//定义浮点型变量WXFloat b = 3.14;printf("b:%.2f\n",b);MyFloat c = 3.24;printf("c:%.2f\n",c);string s = "28期";printf("s:%s\n",s);Point p = {1.3,2.4};Py p1 = {1.2,2.3};Po p2 = {1.4,5.6};//函数指针// int (*p)(int a, int b) = getSum;//定义函数指针MySum p3 = getSum;int result = p3(2,3);printf("result:%d\n",result);return 0;}//定义求和函数int  getSum(int a, int b) {return a + b;}
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