* fwrite 和 fread *

#include<stdio.h>
int main()
{
    struct student
    {
        char name[20];
        int age;
        int num;
    }mystudent;

    FILE *fp;
    fp = fopen("bal.txt", "w");
    while (1)
    {
        printf("請輸入學生的姓名，年齡，學號\n");
        scanf("%s%d%d", mystudent.name, &mystudent.age, &mystudent.num);
        fwrite(&mystudent, sizeof(struct student), 1
 
, fp);
        printf("是否繼續輸入?(Y/N)\n");
        fflush(stdin);
        int ch = getchar();
        if (ch == 'N' || ch == 'n')
        {
            break;
        }
    }
}
fclose(fp);

FILE *fr;
fr = fopen("bal.txt", "r");
while (1)
{
    fread(&mystudent, sizeof(struct student), 1, fr);
    printf
 
("%s\t%d\t%d\t", mystudent.name, mystudent.age, mystudent.num);
    printf("是否退出？(Y/N)\N");
    fflush(stdin);
    int ch = getchar();
    if (ch == 'N' || ch == 'n')
    {
        break;
    }
}
fclose(fr);

fprintf 和 fscanf

#include <stdio.h>
struct student
{
    char name[20];
    int age;
    int
 
 num;
}mystudent;
int main()
{
    FILE *fp;
    if ((fp = fopen("test.txt", "w")) == NULL)
    {
        printf("檔案開啟失敗\n");
        system("pause");
        return 0;
    }
    while (1)
    {
        printf("請輸入學生的姓名，年齡，學號:\n");
        scanf("%s%d%d", mystudent.name, &mystudent.age, &mystudent.num);
        //  fscanf(read, "%s\t%d\t%d\t", mystudent.name, &mystudent.age, &mystudent.num);
        fprintf(fp, "%s\t%d\t%d\t", mystudent.name, mystudent.age, mystudent.num);
        printf("是否繼續輸入(Y/N)\n");
        fflush(stdin);  //清空快取區
        int ch = getchar();
        if (ch == 'N' || ch == 'n')
        {
            break;
        }
    }
    fclose(fp);

    FILE *read;
    if ((read = fopen("test.txt", "r")) == NULL)
    {
        printf("檔案開啟失敗\n");
        system("pause");
        return 0;
    }
    while (1)
    {
        printf("請輸入學生的姓名，年齡，學號:\n");
        fscanf(read, "%s\t%d\t%d\t", mystudent.name, &mystudent.age, &mystudent.num);
        fprintf(fp, "%s\t%d\t%d\t", mystudent.name, mystudent.age, mystudent.num);
        printf("是否繼續輸入(Y/N)\n");
        fflush(stdin);  //清空快取區
        int ch = getchar();
        if (ch == 'N' || ch == 'n')
        {
            break;
        }
    }
    fclose(fp);
    system("pause");
    return 0;
}