我的程序接受用户输入，并将其存储在我定义为结构的Records数组中struct Record。
用户输入是该结构的字段。一切都遵循无错误，但似乎我无法正确设置格式。我的程序一直在询问用户输入，直到当用户询问是否有记录时才输入“ n”。
一旦没有更多的记录，程序将循环遍历创建的记录，并用选项卡将这些记录的文件打印隔开，最后以换行符开始下一条记录。但是，它不是以新的行开始并以相同的方式打印另一条记录，而是会覆盖先前打印的记录，并进一步标记下一条记录。
是什么原因导致这种情况发生？
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
struct Record
{
char fname[51];
char lname[51];
char address[51];
char city[51];
char state[51];
char zipcode[51];
char phoneNumber[51];
};
int main()
{
FILE *fileWriter;
const char filename[] = "data.txt";
char answer = 'y';
int size = 1;
int i = 0;
struct Record *records;
struct Record *records_temp = NULL;
while(answer == 'y' || answer == 'Y')
{
struct Record *records_temp = calloc((size),sizeof(*records));
records = records_temp;
printf("First Name: \n");
scanf("%s", records[size-1].fname);
printf("Last Name: \n");
scanf("%s", records[size-1].lname);
printf("Address: \n");
scanf(" %[^\n]", records[size-1].address);
printf("City: \n");
scanf("%s", records[size-1].city);
printf("State: \n");
scanf("%s", records[size-1].state);
printf("Zipcode: \n");
scanf("%s", records[size-1].zipcode);
printf("Phone Number: \n");
scanf("%s", records[size-1].phoneNumber);
//stores all record info
printf("Are there anymore records? [y/n] ");
scanf(" %c", &answer);
if(answer == 'y' || answer == 'Y')
{
size++;
printf("\n");
}
}
//open file
fileWriter = fopen(filename,"wb");
if(fileWriter != NULL)
{
for(;i< size; i++)
{
fprintf(fileWriter,"%s\t",records[i].fname);
fprintf(fileWriter,"%s\t",records[i].lname);
fprintf(fileWriter,"%s\t",records[i].address);
fprintf(fileWriter,"%s\t",records[i].city);
fprintf(fileWriter,"%s\t",records[i].state);
fprintf(fileWriter,"%s\t",records[i].zipcode);
fprintf(fileWriter,"%s\n",records[i].phoneNumber);
}
free(records);
fclose(fileWriter);
}
else
{
printf("Error opening file.");
}
}
我对代码进行了一些更改，但是我认为您应该在此处将链表用作数据结构，它更简单并且消耗更少的内存。我做了一些尝试，一切顺利。:)希望能对您有所帮助！
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
typedef struct Record Record;
struct Record
{
char fname[51];
char lname[51];
char address[51];
char city[51];
char state[51];
char zipcode[51];
char phoneNumber[51];
Record *next;
};
int main()
{
FILE *fileWriter;
const char filename[] = "data.txt";
char answer = '\0';
// int size = 1;
// int i = 0;
Record *records = NULL;
Record *records_first = NULL;
Record *records_previous = NULL;
fileWriter = fopen(filename,"wb");
if(fileWriter != NULL) {
for( ; ; ) {
records = (Record*) malloc(sizeof(Record));
if(records_first == NULL)
records_first = records;
if(records_previous != NULL)
records_previous->next = records;
records = records_first;
printf("First Name: \n");
scanf("%s", records->fname);
fprintf(fileWriter,"%s\t",records->fname);
printf("Last Name: \n");
scanf("%s", records->lname);
fprintf(fileWriter,"%s\t",records->lname);
printf("Address: \n");
scanf(" %[^\n]", records->address);
fprintf(fileWriter,"%s\t",records->address);
printf("City: \n");
scanf("%s", records->city);
fprintf(fileWriter,"%s\t",records->city);
printf("State: \n");
scanf("%s", records->state);
fprintf(fileWriter,"%s\t",records->state);
printf("Zipcode: \n");
scanf("%s", records->zipcode);
fprintf(fileWriter,"%s\t",records->zipcode);
printf("Phone Number: \n");
scanf("%s", records->phoneNumber);
fprintf(fileWriter,"%s\t\n\n",records->phoneNumber);
records->next = NULL;
records_previous = records;
printf("Are there anymore records? [y/n] ");
scanf(" %c", &answer);
if(tolower(answer) != 'y') {
free(records);
fclose(fileWriter);
break;
}
}
} else
printf("Error opening file.");
return 0;
}
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