我正在尝试制作随机访问归档程序，它只是为了开始。当我查看 biodata.txt 有很多奇怪的字符时，我遇到了关于归档 addData 函数无法正常工作的问题。我正在尝试使用结构归档。
#include <stdio.h>
#include <conio.h>
struct biodata{
int recno,age;
char name[20],sex;
float salary;
}obj;
int main(){
void addData(void);
void showRecord(void);
char choice;
while(1){
printf("\n\n*****CHOOSE YOUR CHOICE*****\n");
printf("1) ADD DATA\n");
printf("2) SHOW RECORD\n");
printf("Enter your choice : ");
choice = getche();
switch(choice){
case '1' : //call add data
addData();
break;
case '2' : //call show record
showRecord();
break;
}
}
}
//Adding Record to File
void addData(){
FILE *fp;
fp = fopen("biodata.txt","a+t");
printf("\n*****ADDING DATA*****\n");
printf("\nEnter Record No : ");
scanf("%d",&obj.recno);
printf("Enter Name : ");
scanf("%s",&obj.name);
printf("Enter age : ");
scanf("%d",&obj.age);
printf("Enter Sex : ");
scanf("%c",&obj.sex);
printf("Enter Salary : ");
scanf("%f",&obj.salary);
fseek(fp,(obj.recno-1)*sizeof(obj),SEEK_SET);
fwrite(&obj,sizeof(obj),1,fp);
fclose(fp);
}
void showRecord(){
FILE *fp;
struct biodata obj;
int rec;
long pos;
fp = fopen("biodata.txt","r");
printf("\n*****SHOWING SPECIFIC RECORD*****\n");
printf("\nEnter Record No : ");
scanf("%d",&rec);
pos = rec * sizeof(obj);
fseek(fp,pos,SEEK_SET);
if(feof(fp)==0)
printf("\n\nNO DATA FOUND\n");
else{
fscanf(fp,"%d %s %d %c %f",&obj.recno,obj.name,&obj.age,&obj.sex,&obj.salary);
printf("\n\n\tRecord No : %d\n",obj.recno);
printf("\tName : %s\n",obj.name);
printf("\tAge : %d\n",obj.age);
printf("\tSex : %c\n",obj.sex);
printf("\tSalary : %f\n",obj.salary);
}
getch();
fclose(fp);
}