关于switchcase语句中break后会不会释放缓存？
程序代码：// 学生管理系统.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include "stdio.h"
#include "stdlib.h"
#include "string.h"
#define LEN 1024
//==================================
void vIface();
void vgn2();
//学生成员结构
typedef struct sStudent
{
int iNumber;
char cName[50];
char cSex[4];
int iAge;
int iGrade;
int iClass;
int iSeat;
float fChina;
float fEnglish;
float fMath;
double dAverage;
double dTotal;
sStudent* pNext;
}cstu[LEN],stu;
//创建单链表并录入数据
stu* screate(stu* lhead)
{
int i=0;
char Yn[4];
stu* pNew, *pEnd;
lhead =(stu*) malloc(sizeof(stu));
if (lhead == NULL)
{
printf("创建头节点失败!\n");
exit(1);
}
pEnd = lhead;
printf("输入y或者n选择操作:\n");
scanf_s("%s", Yn,4);
while(strncmp(Yn,"Y",4)==0|| strncmp(Yn, "y", 4) == 0)
{
i++;
pNew= (stu*)malloc(sizeof(stu));
printf("学号:");
scanf_s("%d", &pNew->iNumber);
printf("姓名:");
scanf_s("%s", pNew->cName,50);
printf("性别:");
scanf_s("%s", pNew->cSex,4);
printf("年龄:");
scanf_s("%d", &pNew->iAge);
printf("年级:");
scanf_s("%d", &pNew->iGrade);
printf("班级:");
scanf_s("%d", &pNew->iClass);
printf("座位:");
scanf_s("%d", &pNew->iSeat);
printf("请输入三门科目成绩:\n");
getchar();
printf("语文:");
scanf_s("%f", &pNew->fChina);
printf("数学:");
scanf_s("%f", &pNew->fMath);
printf("英语:");
scanf_s("%f", &pNew->fEnglish);
if (pNew == NULL)
{
pEnd = pNew;
}
else
{
pNew->pNext = NULL;
pEnd->pNext = pNew;
pEnd = pNew;
}
getchar();
printf("输入y或者n选择操作:\n");
scanf_s("%c", Yn, 4);
if (strncmp(Yn, "Y", 4) != 0 || strncmp(Yn, "y", 4) != 0)
{
continue;
}
}
pEnd->pNext = NULL;
return lhead;
}
//打印学生管理系统链表
void vPrint(stu* lHead)
{
int i=0;
stu* sTemp;
sTemp = lHead;
if (sTemp == NULL)
{
printf("空链表!\n");
exit(1);
}
sTemp=sTemp->pNext;
while (sTemp!= NULL)
{
sTemp->dTotal = sTemp->fChina + sTemp->fMath + sTemp->fEnglish;
sTemp->dAverage = sTemp->dTotal / 3;
printf("学号\t姓名\t性别\t年龄\t年级\t班级\t座位\t 语文\t\t 数学\t\t 英语\t\t 总分数\t 平均分\n");
printf("%d\t %s\t %s\t %d\t %d\t %d\t %d\t %.4f分\t %.4f\t %.4f\t %.4lf\t %.4lf\n", sTemp->iNumber, sTemp->cName, sTemp->cSex, sTemp->iAge, sTemp->iGrade, sTemp->iClass, sTemp->iSeat, sTemp->fChina, sTemp->fMath, sTemp->fEnglish, sTemp->dTotal, sTemp->dAverage);
sTemp = sTemp->pNext;
++i;
}
printf("总节点为:%d\n", i);
}
void vSearch(stu* lHead,int search_num)
{
int i = 0;
stu* iTemp;
iTemp = lHead;
if (iTemp == NULL)
{
printf("空链表");
exit(1);
}
iTemp = iTemp->pNext;
while (iTemp!=NULL)
{
i++;
iTemp = iTemp->pNext;
iTemp->dTotal = iTemp->fChina + iTemp->fMath + iTemp->fEnglish;
iTemp->dAverage = iTemp->dTotal / 3;
if (iTemp->iNumber == search_num)
{
printf("查询到以下信息:\n");
printf("\n");
printf("学号\t姓名\t性别\t年龄\t年级\t班级\t座位\t 语文\t\t 数学\t\t 英语\t\t 总分数\t 平均分\n");
printf("%d\t %s\t %s\t %d\t %d\t %d\t %d\t %.4f分\t %.4f\t %.4f\t %.4lf\t %.4lf\n", iTemp->iNumber, iTemp->cName, iTemp->cSex, iTemp->iAge, iTemp->iGrade, iTemp->iClass, iTemp->iSeat, iTemp->fChina, iTemp->fMath, iTemp->fEnglish, iTemp->dTotal, iTemp->dAverage);
break;
}
}
printf("\n");
printf("查询成功!\n");
}
void vIface()
{
printf("\t=============================学生信息管理系统=============================\n");
printf("\t*\t\t\t\t\t\t\t\t"); printf("\t *\n");
printf("\t*\t\t\t\t\t\t\t\t"); printf("\t *\n");
printf("\t*\t\t\t"); printf(" *1.录入学生信息*"); printf("\t\t\t\t *\n");
printf("\t*\t\t\t\t\t\t\t\t"); printf("\t *\n");
printf("\t*\t\t\t"); printf(" *2.查询学生信息*"); printf("\t\t\t\t *\n");
printf("\t*\t\t\t\t\t\t\t\t"); printf("\t *\n");
printf("\t*\t\t\t"); printf(" *3.打印学生信息*"); printf("\t\t\t\t *\n");
printf("\t*\t\t\t\t\t\t\t\t"); printf("\t *\n");
printf("\t*\t\t\t"); printf(" *4.删除学生信息*"); printf("\t\t\t\t *\n");
printf("\t*\t\t\t\t\t\t\t\t"); printf("\t *\n");
printf("\t*\t\t\t"); printf(" *5.排序学生成绩*"); printf("\t\t\t\t *\n");
printf("\t*\t\t\t\t\t\t\t\t"); printf("\t *\n");
printf("\t*\t\t\t"); printf(" *6.保存学生信息*"); printf("\t\t\t\t *\n");
printf("\t*\t\t\t\t\t\t\t\t"); printf("\t *\n");
printf("\t*\t\t\t"); printf(" *7.载入学生信息*"); printf("\t\t\t\t *\n");
printf("\t*\t\t\t\t\t\t\t\t"); printf("\t *\n");
printf("\t*\t\t\t"); printf(" *8.修改学生信息*"); printf("\t\t\t\t *\n");
printf("\t*\t\t\t\t\t\t\t\t"); printf("\t *\n");
printf("\t*\t\t\t"); printf(" *8.退出系统操作*"); printf("\t\t\t\t *\n");
printf("\t*\t\t\t\t\t\t\t\t"); printf("\t *\n");
printf("\t*\t\t\t\t\t\t\t\t"); printf("\t *\n");
printf("\t=============================学生信息管理系统=============================\n");
vgn2();
}
//界面选项操作
void vgn2()
{
stu* itemp=NULL;
int inum;
int itemp_num;
printf("输入1~8并回车选择需要操作的选项:\n");
scanf_s("%d", &inum);
switch (inum)
{
case 1:
screate(itemp);
break;
case 2:
printf("输入要查询的节点:\n");
scanf_s("%d", &itemp_num);
vSearch(itemp, itemp_num);
break;
case 3:
vPrint(itemp);
break;
default:
printf("操作错误!\n");
break;
}
vIface();
}
int main()
{
//stu* itemp;
//int inum;
/*itemp=screate();
vPrint(itemp);
printf("输入要查询的节点:\n");
scanf_s("%d", &inum);
vSearch(itemp,inum);*/
vIface();
return 0;
}
这是一段单链表伪代码，在main函数直接调用时，录入数据后可以打印出来，可以查询数据。
我想实现单链表各功能选择项操作。使用switch语句之后，录入数据之后，再回到界面选择打印之前录入的数据，只有显示空链表，没有数据。
我想问一下各位前辈。是否return 的head节点因为break，所以释放了缓存？
