C语言 结构体和指针详解及简单示例

struct stu{
 char *name; //姓名
 int num; //学号
 int age; //年龄
 char group; //所在小组
 float score; //成绩
} stu1 = { "Tom", 12, 18, 'A', 136.5 };
//结构体指针
struct stu *pstu = &stu1;

struct stu{
 char *name; //姓名
 int num; //学号
 int age; //年龄
 char group; //所在小组
 float score; //成绩
} stu1 = { "Tom", 12, 18, 'A', 136.5 }, *pstu = &stu1;

#include <stdio.h>
int main(){
 struct{
 char *name; //姓名
 int num; //学号
 int age; //年龄
 char group; //所在小组
 float score; //成绩
 } stu1 = { "Tom", 12, 18, 'A', 136.5 }, *pstu = &stu1;
    //读取结构体成员的值
    printf("%s的学号是%d，年龄是%d，在%c组，今年的成绩是%.1f！\n", (*pstu).name, (*pstu).num, (*pstu).age, (*pstu).group, (*pstu).score);
    printf("%s的学号是%d，年龄是%d，在%c组，今年的成绩是%.1f！\n", pstu->name, pstu->num, pstu->age, pstu->group, pstu->score);
    return 0;
}

#include <stdio.h>
struct stu{
 char *name; //姓名
 int num; //学号
 int age; //年龄
 char group; //所在小组
 float score; //成绩
}stus[] = {
 {"Zhou ping", 5, 18, 'C', 145.0},
 {"Zhang ping", 4, 19, 'A', 130.5},
 {"Liu fang", 1, 18, 'A', 148.5},
 {"Cheng ling", 2, 17, 'F', 139.0},
 {"Wang ming", 3, 17, 'B', 144.5}
}, *ps;
int main(){
 //求数组长度
 int len = sizeof(stus) / sizeof(struct stu);
 printf("Name\t\tNum\tAge\tGroup\tScore\t\n");
 for(ps=stus; ps<stus+len; ps++){
 printf("%s\t%d\t%d\t%c\t%.1f\n", ps->name, ps->num, ps->age, ps->group, ps->score);
 }
 return 0;
}

#include <stdio.h>
struct stu{
 char *name; //姓名
 int num; //学号
 int age; //年龄
 char group; //所在小组
 float score; //成绩
}stus[] = {
 {"Li ping", 5, 18, 'C', 145.0},
 {"Zhang ping", 4, 19, 'A', 130.5},
 {"He fang", 1, 18, 'A', 148.5},
 {"Cheng ling", 2, 17, 'F', 139.0},
 {"Wang ming", 3, 17, 'B', 144.5}
};
void average(struct stu *ps, int len);
int main(){
 int len = sizeof(stus) / sizeof(struct stu);
 average(stus, len);
 return 0;
}
void average(struct stu *ps, int len){
 int i, num_140 = 0;
 float average, sum = 0;
 for(i=0; i<len; i++){
 sum += (ps + i) -> score;
 if((ps + i)->score < 140) num_140++;
 }
 printf("sum=%.2f\naverage=%.2f\nnum_140=%d\n", sum, sum/5, num_140);
}