0. 指针和结构体
- 概念：通过
指针保存结构体变量地址struct Person { char *name; int age; double height; }; struct Person sp = {"wxx", 18, 2.00}; struct Person *sip = NULL; sip = &sp; - 操作
struct Person { char *name; int age; double height; }; struct Person sp = {"wxx", 18, 2.00}; struct Person *sip = NULL; sip = &sp; (*sip).name = "qtt"; (*sip). age = 18; (*sip). height = 1.75; printf("name = %s, age = %i, height = %lf\n", (*sip).name, (*sip). age, (*sip). height); sip->name = "xdy"; sip->age = 1; sip->height = 0.75; printf("name = %s, age = %i, height = %lf\n", sip->name, sip->age, sip->height);
1. 结构体数组
- 概念：
数组元素为结构体值struct Department { char *name; int count; double kpi; }; struct Department departments[3] = { {"iOS", 10, 100.0}, {"andorid", 10, 88.0}, {"php", 100, 66.0} }; departments[0].name = "秦子阳"; departments[0].count = 1000; departments[0].kpi = 10000.0; printf("name = %s, count = %i, kpi = %lf\n", departments[0].name, departments[0].count, departments[0].kpi);
2. 结构体嵌套
- 概念：
结构体属性又是一个结构体struct Time { int HH; int mm; int ss; }; struct Data { int year; int month; int day; struct Time time; }; struct Person { char *name; int age; struct Data work; }; struct Person sp = { "wxx", 18, { 2016, 10, 10, { 9, 10, 8 } } }; printf("year = %i, month = %i, day = %i\n", sp.work.year, sp.work.month, sp.work.day);
3. 结构体和函数
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结构体类型变量作为形参，修改形参数据不能改变实参数据struct Person { char *name; int age; double height; }; void demo(struct Person); int main(int argc, const char * argv[]) { struct Person sp = {"wx", 18, 2.00}; demo(sp); printf("sp.age = %i\n", sp.age); return 0; } void demo(struct Person p) { p.age = 20; printf("p.age = %i\n", p.age); } -
结构体类型指针变量作为形参，修改形参数据会改变实参数据struct Person { char *name; int age; double height; }; void demo(struct Person *); int main(int argc, const char * argv[]) { struct Person sp = {"wx", 18, 2.00}; demo(&sp); printf("sp.age = %i\n", sp.age); return 0; } void demo(struct Person *p) { p->age = 20; printf("p.age = %i\n", p->age); }
