从文本文件中删除数据（c编程）

我正在用c语言编程 用于添加学生信息，例如（姓名、TP、国籍、性别、年龄） 并且更喜欢一些功能，例如删除 对于删除部分，我将信息移动到另一个文件中，但我选择的学生除外，或者我键入了他的TP号码来删除。 但是阅读部分有问题，所以它不会删除

void add ()


e = fopen_s(&f,"student.txt","a+");
int studentcount ;
printf("pelase enter how many students u want to add");
scanf("%d",&studentcount);
if(e!=0)
{
    printf("File could not be created.");
    exit(1);
}
for(i = 0; i<studentcount;i++)
{
    fflush(stdin);
    printf("\nPlease enter the student name : ");
    gets(name);
    printf("\nPlease enter the student nationality : ");
    gets(nationality);
    printf("\nPlease enter the student gender : ");
    gets(gender);
    printf("\nPlease enter the student age : ");
    scanf("%d", &age);
    printf("\nPlease enter the TP number : ");
    scanf("%d", &TP);
    printf("\nPlease enter the student contact number : ");
    scanf("%d", &contact);
    fprintf(f,"%i\t %s\t %s\t %s\t %d\t ;%d;\t %d\n",strlen(name), name, nationality, gender, age, TP,contact);
}


fclose(f);

main();

---

以相同格式读取的文件中打印的格式。这样做就容易了

在

add（）

函数

fprintf

中进行以下更改。因此，当使用

fscanf

在

delete

中读取时，将很容易

fprintf(f,"%i\t %s\t %s\t %s\t %d\t %d\t %d\n",strlen(name), name, nationality, gender, age, TP,contact); // don't use semi colon in between

而不是这种逻辑-

c = getc (originalfile);
while (c !=EOF)
{
     c = getc (originalfile);
     if (c == '\n')
     temp++;
     if (c != deltp)
     {
        fputc (c,newfile);
     }
}

用这个逻辑——

int len;
printf ("please enter the student TP\n");
scanf ("%d",&deltp);
FILE *newfile =  fopen ("student_temp.txt","w");
while((fscanf(originalfile,"%i %s %s %s %d %d %d",&len, name, nationality, &gender, age, &TP, &contact))!=EOF){
    if(deltp != TP)
    fprintf(newfile,"%i\t %s\t %s\t %s\t %d\t ;%d;\t %d\n",strlen(name), name, nationality, gender, age, TP,contact);
}
fclose(newfile);
fclose(originalfile);

---

希望这对你有帮助

您可以自己调试这个：

int len;
printf ("please enter the student TP\n");
scanf ("%d",&deltp);
FILE *newfile =  fopen ("student_temp.txt","w");
while((fscanf(originalfile,"%i %s %s %s %d %d %d",&len, name, nationality, &gender, age, &TP, &contact))!=EOF){
    if(deltp != TP)
    fprintf(newfile,"%i\t %s\t %s\t %s\t %d\t ;%d;\t %d\n",strlen(name), name, nationality, gender, age, TP,contact);
}
fclose(newfile);
fclose(originalfile);