结构体做函数参数

结构体值栈空间内存模型

{
    int i = 0;
    for (; i < num; i++)
    {
        printf("age : %d\n",array[i].age);
    }
}

void sortTeacher(Teacher *array,int num)
{
    int i,j;
    Teacher tmp;
    
    for (i = 0; i < num; i++)
    {
        for (j = i+1; j < num; j++)
        {
            if (array[i].age > array[j].age)
            {
                tmp = array[j];
                array[j] = array[i];
                array[i] = tmp;
            }
        }
    }
}

int main()
{
    int i = 0;
    Teacher Array[3];
    int num = sizeof(Array)/sizeof(Array[0]);

    for(i = 0; i < num; i++)
    {
        printf("\nplease enter age:");
        scanf("%d",&(Array[i].age));
    }

    printTeacher(Array,num);//

    sortTeacher(Array,num);

    printf("after sort\n");
    printTeacher(Array,num);

    return 0;
}

结构体堆空间内存模型

#include<stdio.h>
#include<string.h>
#include<stdlib.h>

typedef struct Teacher
{
    char name[64];
    int age;
    int id;
}Teacher;

void printTeacher(Teacher *array,int num)
{
    int i = 0;
    for (; i < num; i++)
    {
        printf("age : %d\n",array[i].age);
    }
}

void sortTeacher(Teacher *array,int num)
{
    int i,j;
    Teacher tmp;
    
    for (i = 0; i < num; i++)
    {
        for (j = i+1; j < num; j++)
        {
            if (array[i].age > array[j].age)
            {
                tmp = array[j];
                array[j] = array[i];
                array[i] = tmp;
            }
        }
    }
}

Teacher *createTeacher(int num)
{
    Teacher *tmp = NULL;
    tmp = (Teacher *)malloc(num * sizeof(Teacher));
    if (NULL == tmp)
    {
        return NULL;
    }

    return tmp;
}

void FreeTeacher(Teacher *p)
{
    if (p != NULL)
    {
        free(p);
    }
}

int main()
{
    int i = 0;
    int num = 3;
    Teacher *pArray = NULL;
    pArray = createTeacher(num);

    for(i = 0; i < num; i++)
    {
        printf("\nplease enter age:");
        scanf("%d",&(pArray[i].age));
    }

    printTeacher(pArray,num);

    sortTeacher(pArray,num);

    printf("after sort\n");
    printTeacher(pArray,num);

    FreeTeacher(pArray);
    return 0;
}