Ｃ基础：结构体

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结构体定义：struct complex_struct { double x, y; } z1, z2; 声明变量：struct complex_struct z3, z4; 或：complex_struct z1 = { x, 4.0, }; /* z1.x=3.0, z1.y=4.0 */ complex_struct z2 = { 3.0, }; /* z2.x=3.0, z2.y=0.0 */ complex_struct z3 = { }; /* z3.x=0.0, z3.y=0.0 */

1、测试例子：结构体的初始化

#include <stdio.h>int main(void){    struct HELLO_WORLD {        long x,y;    } myX1,myX2;    struct HELLO_WORK{        int m;        long n;    };    struct HELLO_WORK myM1 = {1,2.0,};//参数后面可以多个“，”号    struct HELLO_WORK myM2 = {};//使用0去初始化    struct HELLO_WORK myM3 = {3};//单个参数初始化，第二个用0    //myX1 = {4.5,5.6};    myX2.x = 6.7;    myX2.y = 7.8;    printf("myX1.x:%ld\t,myX1.y:%ld\t,myX2.x:%ld\t,myX2.y:%ld\t\n",myX1.x,myX1.y,myX2.x,myX2.y);       printf("myM1.m:%d\t,myM1.n:%ld\t,myM2.m:%d\t,myM2.n:%ld\t,myM3.m:%d\t,myM3.n:%ld\t\n",myM1.m,myM1.n,myM2.m,myM2.n,myM3.m,myM3.n);        return 0;}

打印：

myX1.x:0,myX1.y:4195344,myX2.x:6,myX2.y:7 myM1.m:1,myM1.n:2,myM2.m:0,myM2.n:0,myM3.m:3,myM3.n:0

2、测试例子：结构体函数

#include <stdio.h>struct HELLO_WORLD {    int x,y;};struct HELLO_WORLD addHelloworldStruct(struct HELLO_WORLD struct1,struct HELLO_WORLD struct2){    struct1.x = struct1.x + struct2.x;    struct1.y = struct1.y + struct2.y;    return struct1;}int main(void){    struct HELLO_WORLD x = {1,2};    struct HELLO_WORLD y = {3,4};    struct HELLO_WORLD z = addHelloworldStruct(x,y);    printf("x:%d\t,y:%d\t\n",z.x,z.y);    return 0;}

打印：

x:4,y:6