C 将另一条记录添加到动态内存数据库时出错
我的任务是用一些数据初始化头中的结构。然后使用指针,通过对较大/较小的数据块进行malloc处理并复制数据来添加/删除数据 目前,我的addRecord功能不起作用,因为它似乎总是添加相同的垃圾(记录编号1的一部分): 姓名= 火灾编号=阿坦(似乎是曼哈顿的一部分) 街道=ork(似乎是纽约的一部分) City=cret(似乎是秘密的一部分) 州=棕褐色(似乎是曼哈顿的一部分) 我做错了什么 我的标题:C 将另一条记录添加到动态内存数据库时出错,c,pointers,struct,dynamic-memory-allocation,C,Pointers,Struct,Dynamic Memory Allocation,我的任务是用一些数据初始化头中的结构。然后使用指针,通过对较大/较小的数据块进行malloc处理并复制数据来添加/删除数据 目前,我的addRecord功能不起作用,因为它似乎总是添加相同的垃圾(记录编号1的一部分): 姓名= 火灾编号=阿坦(似乎是曼哈顿的一部分) 街道=ork(似乎是纽约的一部分) City=cret(似乎是秘密的一部分) 州=棕褐色(似乎是曼哈顿的一部分) 我做错了什么 我的标题: #include <stdio.h> #include <stdlib.h
#include <stdio.h>
#include <stdlib.h>
struct structPointer{
char name[51];
char fireNumber[11];
char street[26];
char city[26];
char state[26];
};
#包括
#包括
结构指针{
字符名[51];
煤焦火号[11];
查街[26];;
查尔城[26];
半焦态[26];
};
我的c文件:
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include "myData.h"
struct structInit *sP;
struct structInit *sSP;
int recordNumber = 0;
int numberOfAccesses = 0;
int main(void) {
sP = (struct structInit *) malloc(5 * sizeof(struct structInit));
sSP = sP;
memcpy(sP->name,"Adam Baum",51);
memcpy(sP->fireNumber,"N1234",11);
memcpy(sP->street,"Top Secret",26);
memcpy(sP->city,"Manhattan",26);
memcpy(sP->state,"New York",26);
sP++;
recordNumber++;
memcpy(sP->name,"Adam Zapel",51);
memcpy(sP->fireNumber,"S4321",11);
memcpy(sP->street,"Throat",26);
memcpy(sP->city,"Manhattan",26);
memcpy(sP->state,"New York",26);
sP++;
recordNumber++;
memcpy(sP->name,"Al Bino",51);
memcpy(sP->fireNumber,"W1234",11);
memcpy(sP->street,"White",26);
memcpy(sP->city,"Anchorage",26);
memcpy(sP->state,"Alaska",26);
sP++;
recordNumber++;
memcpy(sP->name,"Anne Teak",51);
memcpy(sP->fireNumber,"E4321",11);
memcpy(sP->street,"Oak",26);
memcpy(sP->city,"Woodville",26);
memcpy(sP->state,"Wisconsin",26);
sP++;
recordNumber++;
memcpy(sP->name,"Barb Dwyer",51);
memcpy(sP->fireNumber,"N1234",11);
memcpy(sP->street,"Keepout",26);
memcpy(sP->city,"Kilgore",26);
memcpy(sP->state,"Texas",26);
recordNumber++;
sP = sSP;
int sel;
while (1){
printf("MENU\n");
printf("=====\n");
printf("1. Print All Records\n");
printf("2. Print Number of Records\n");
printf("3. Print Size of Database\n");
printf("4. Add Record\n");
printf("5. Delete Record\n");
printf("6. Print Number of Accesses to Database\n");
printf("7. Exit\n");
printf("=====\n");
printf("Enter selection: ");
scanf("%d", &sel);
printf("\n");
switch(sel){
case 1:
numberOfAccesses++;
printAllRecords(sP);
break;
case 2:
numberOfAccesses++;
fprintf(stderr,"There are a Total of %d records.\n\n", recordNumber);
break;
case 3:
numberOfAccesses++;
printSizeOfDatabase(sP);
break;
case 4:
numberOfAccesses++;
sP = sSP;
addRecord(sP);
break;
case 5:
numberOfAccesses++;
deleteRecord(sP);
break;
case 6:
numberOfAccesses++;
fprintf(stderr,"The total number of Accesses is %d\n\n", numberOfAccesses);
break;
case 7:
exit(0);
default:
printf("Error: Input was not a valid selection.\n\n");
break;
}
}
return 0;
}
int printAllRecords(struct structInit *structPointer){
int i;
structPointer = sSP;
printf("All Records: \n");
for(i=1;i<=recordNumber;i++){
printf("Record Number: %d\n", i);
fprintf(stderr, "Name = \%s\n", structPointer-> name);
fprintf(stderr, "Fire Number = \%s\n", structPointer-> fireNumber);
fprintf(stderr, "Street = \%s\n", structPointer-> street);
fprintf(stderr, "City = \%s\n", structPointer-> city);
fprintf(stderr, "State = \%s\n\n", structPointer-> state);
structPointer++;
}
return 1;
}
int printSizeOfDatabase(struct structInit *structPointer) {
int size = 0;
int i;
for (i=1;i<=recordNumber;i++) {
size += sizeof(structPointer->name);
size += sizeof(structPointer->fireNumber);
size += sizeof(structPointer->street);
size += sizeof(structPointer->city);
size += sizeof(structPointer->state);
structPointer++;
}
fprintf(stderr, "The size of the database is %d bytes.\n\n", size);
return size;
}
int addRecord(struct structInit *structPointer){
char entryName;
char entryFireNumber;
char entryStreet;
char entryCity;
char entryState;
recordNumber++;
struct structInit *theStruct;
theStruct = (struct structInit *) malloc ((recordNumber+1) * sizeof(struct structInit));
int i;
for (i=1;i<recordNumber;i++){
memcpy(theStruct->name,structPointer->name,51);
memcpy(theStruct->fireNumber,structPointer->fireNumber,11);
memcpy(theStruct->street,structPointer->street,26);
memcpy(theStruct->city,structPointer->city,26);
memcpy(theStruct->state,structPointer->state,26);
/*if(i==recordNumber){
theStruct++;}
else{
theStruct++;
structPointer++;}*/
theStruct++;
structPointer++;
}
theStruct++;
printf("Enter the Name of the New Record: \n");
scanf("%s",&entryName);
memcpy(theStruct->name,&entryName,51);
printf("Enter the Fire Number of the New Record: \n");
scanf("%s",&entryFireNumber);
memcpy(theStruct->fireNumber,&entryFireNumber,11);
printf("Enter the Street of the New Record: \n");
scanf("%s",&entryStreet);
memcpy(theStruct->street,&entryStreet,26);
printf("Enter the City of the New Record: \n");
scanf("%s",&entryCity);
memcpy(theStruct->city,&entryCity,26);
printf("Enter the State of the New Record: \n");
scanf("%s",&entryState);
memcpy(theStruct->state,&entryState,26);
structPointer=theStruct;
printf("Record has been added.\n\n");
return 0;
}
int deleteRecord(struct structInit *structPointer){
struct structInit *anotherStruct;
anotherStruct = (struct structInit *) malloc ((recordNumber+1) * sizeof(struct structInit));
int i;
for(i=0;i<5;i++){
memcpy(anotherStruct->name,structPointer->name,51);
memcpy(anotherStruct->fireNumber,structPointer->fireNumber,11);
memcpy(anotherStruct->street,structPointer->street,26);
memcpy(anotherStruct->city,structPointer->city,26);
memcpy(anotherStruct->state,structPointer->state,26);
structPointer++;
}
structPointer=anotherStruct;
recordNumber--;
printf("Record has been deleted.\n\n");
return 0;
}
#包括
#包括
#包括
#包括
#包括“myData.h”
struct structInit*sP;
struct structInit*sSP;
int recordNumber=0;
int numberofaccess=0;
内部主(空){
sP=(struct structInit*)malloc(5*sizeof(struct structInit));
sSP=sP;
memcpy(sP->name,“Adam Baum”,51岁);
memcpy(sP->fireNumber,“N1234”,11);
memcpy(sP->street,“绝密”,26);
memcpy(sP->city,“曼哈顿”,26岁);
memcpy(sP->state,“纽约”,26);
sP++;
recordNumber++;
memcpy(sP->name,“Adam Zapel”,51岁);
memcpy(sP->fireNumber,“S4321”,11);
memcpy(sP->街道,“咽喉”,26);
memcpy(sP->city,“曼哈顿”,26岁);
memcpy(sP->state,“纽约”,26);
sP++;
recordNumber++;
memcpy(sP->name,“Al Bino”,51);
memcpy(sP->fireNumber,“W1234”,11);
memcpy(sP->street,“White”,26);
memcpy(sP->city,“Anchorage”,26);
memcpy(sP->州,“阿拉斯加”,26);
sP++;
recordNumber++;
memcpy(sP->名称,“安妮柚木”,51);
memcpy(sP->fireNumber,“E4321”,11);
memcpy(sP->street,“Oak”,26);
memcpy(sP->city,“Woodville”,26岁);
memcpy(sP->state,“威斯康星州”,26);
sP++;
recordNumber++;
memcpy(sP->name,“Barb Dwyer”,51);
memcpy(sP->fireNumber,“N1234”,11);
memcpy(sP->街道,“禁止通行”,26);
memcpy(sP->city,“Kilgore”,26);
memcpy(sP->德克萨斯州,26);
recordNumber++;
sP=sSP;
内特塞尔;
而(1){
printf(“菜单\n”);
printf(“=======\n”);
printf(“1.打印所有记录\n”);
printf(“2.打印记录数\n”);
printf(“3.数据库的打印大小\n”);
printf(“4.添加记录\n”);
printf(“5.删除记录\n”);
printf(“6.打印访问数据库的次数\n”);
printf(“7.退出\n”);
printf(“=======\n”);
printf(“输入选择:”);
scanf(“%d”和&sel);
printf(“\n”);
开关(sel){
案例1:
numberofaccess++;
打印所有记录(sP);
打破
案例2:
numberofaccess++;
fprintf(stderr,“总共有%d条记录。\n\n”,recordNumber);
打破
案例3:
numberofaccess++;
printSizeOfDatabase(sP);
打破
案例4:
numberofaccess++;
sP=sSP;
addRecord(sP);
打破
案例5:
numberofaccess++;
删除记录(sP);
打破
案例6:
numberofaccess++;
fprintf(stderr,“总访问次数为%d\n\n”,numberofaccess);
打破
案例7:
出口(0);
违约:
printf(“错误:输入不是有效的选择。\n\n”);
打破
}
}
返回0;
}
int printAllRecords(struct structInit*structPointer){
int i;
structPointer=sSP;
printf(“所有记录:\n”);
对于(i=1;i名称);
fprintf(标准,“火灾编号=\%s\n”,结构指针->火灾编号);
fprintf(标准,“街道=\%s\n”,结构指针->街道);
fprintf(标准,“城市=\%s\n”,结构指针->城市);
fprintf(stderr,“State=\%s\n\n”,structPointer->State);
structPointer++;
}
返回1;
}
int printSizeOfDatabase(struct structInit*structPointer){
int size=0;
int i;
for(i=1;iname);
size+=sizeof(结构指针->火号);
尺寸+=sizeof(structPointer->street);
size+=sizeof(结构指针->城市);
size+=sizeof(结构指针->状态);
structPointer++;
}
fprintf(stderr,“数据库大小为%d字节。\n\n”,大小);
返回大小;
}
int addRecord(struct structInit*structPointer){
字符入口名;
字符入口火号;
Charentrystreet;
字符入口;
字符入口状态;
recordNumber++;
struct structInit*结构;
结构=(struct structInit*)malloc((记录编号+1)*sizeof(struct structInit));
int i;
对于(i=1;iname,structPointer->name,51);
memcpy(结构->火号,结构指针->火号,11);
memcpy(建筑->街道,建筑指针->街道,26);
memcpy(结构->城市,结构指针->城市,26);
memcpy(结构->状态,结构指针->状态,26);
/*if(i==记录编号){
结构+++;}
否则{
结构++;
structPointer++;}*/
结构++;
structPointer++;
}
结构++;
printf(“输入新记录的名称:\n”);
scanf(“%s”、&entryName);
memcpy(结构->名称和入口名称,51);
printf(“输入新记录的火灾编号:\n”);
scanf(“%s”、&entryFireNumber);
memcpy(结构->消防编号和入口消防编号,11);
printf(“输入新记录的街道:\n”);
scanf(“%s”和入口街);
memcpy(建筑->街和入口街,26);
printf(“输入新记录所在城市:\n”);
scanf(“%s”、&entryCity);
memcpy(建筑->城市和入口城市,26);
printf(“输入新记录的状态:\n”);
scanf(“%s”&入口状态);
memcpy(结构->状态和入口状态,26);
结构指针=结构;
printf(“已添加记录。\n\n”);
typedef struct structPointer structInit;
char entryName[51];
/* ... */
printf("Enter the Name of the New Record: \n");
scanf("%s", entryName);
int addRecord(struct structInit **structPointer)
{
/* ... */
*structPointer = theStruct;
/* ... */
}
struct structInit a = /* ... */;
struct structInit b = /* ... */;
a = b; /* OK */
int printSizeOfDatabase() {
int size = recordNumber * sizeof(struct structInit);
fprintf(stderr, "The size of the database is %d bytes.\n\n", size);
return size;
}