struct student {
    char name[20];
    int age;
};
int main() {
    struct student s[2] = {0};
    FILE* pf;
    //输入数据
    for (int i = 0; i < 2; i++) {
        printf("输入第%d个学生信息（姓名 年龄）: ", i + 1);
        if (scanf("%19s %d", s[i].name, &s[i].age) != 2) {
            printf("输入格式错误！\n");
            return 1;
        }
    }
    pf = fopen("inf.txt", "w");
    if (pf==NULL) {
        perror("fopen");
        return 1;
    }
    for (int i = 0; i < 2; i++) {
        fprintf(pf, "%s %d\n", s[i].name, s[i].age); //信息输入 
        // 添加换行符
    }
    fclose(pf);
    //读取并显示
    pf = fopen("inf.txt", "r");
    if (pf == NULL) {
        perror("fopen");
        return 1;
    }

    printf("\n文件内容：\n");
    struct student temp;
    for (int i = 0; i < 2; i++) {
        if (fscanf(pf, "%19s %d", temp.name, &temp.age) == 2) {
            printf("学生%d: %s %d\n", i + 1, temp.name, temp.age);
        }
    }
    fclose(pf);
    pf = NULL;
    return 0;
}

struct student {
    char name[20];
    int age;
};
int main() {
    struct student s[2] = {0};
    FILE* pf;
    //输入数据
    for (int i = 0; i < 2; i++) {
        printf("输入第%d个学生信息（姓名 年龄）: ", i + 1);
        if (scanf("%19s %d", s[i].name, &s[i].age) != 2) {
            printf("输入格式错误！\n");
            return 1;
        }
    }
    pf = fopen("inf.txt", "w");
    if (pf==NULL) {
        perror("fopen");
        return 1;
    }
    for (int i = 0; i < 2; i++) {
        fprintf(pf, "%s %d\n", s[i].name, s[i].age); //信息输入 
        // 添加换行符
    }
    fclose(pf);
    //读取并显示
    pf = fopen("inf.txt", "r");
    if (pf == NULL) {
        perror("fopen");
        return 1;
    }

    printf("\n文件内容：\n");
    struct student temp;
    for (int i = 0; i < 2; i++) {
        if (fscanf(pf, "%19s %d", temp.name, &temp.age) == 2) {
            printf("学生%d: %s %d\n", i + 1, temp.name, temp.age);
        }
    }
    fclose(pf);
    pf = NULL;
    return 0;
}

1. struct student {
2. int id;
3. char name[20];
4. float score;
5. }stu1,stu2;
6.  
7. int main(int argc, char* argv[]) {
8. // 从键盘输入两个学生数据，写入一个文件中，再读出这两个学生的数据显示在屏幕上。
9. FILE* source;
10. printf("请输入第一个学生数据：\n");
11. scanf("%d %s %f", &stu1.id, stu1.name, &stu1.score);
12. printf("请输入第二个学生数据：\n");
13. scanf("%d %s %f", &stu2.id, stu2.name, &stu2.score);
14. // 打开源文件
15. source = fopen("example.txt", "w");
16. if (source == NULL) {
17. printf("无法打开源文件: %s\n", argv[1]);
18. return 1;
19. }
20. // 写入文件
21. fprintf(source, "id=%d ## name=%s ## score=%f \n", stu1.id, stu1.name, stu1.score);
22. fprintf(source, "id=%d ## name=%s ## score=%f \n", stu2.id, stu2.name, stu2.score);
23.  
24. // 关闭文件
25. fclose(source);
26.  
27. // 重新打开文件进行读取
28. source = fopen("example.txt", "r");
29. if (source == NULL) {
30. printf("无法读取文件 example.txt\n");
31. return 1;
32. }
33. // 读取数据
34. char buffer[50];
35. struct student temp1, temp2;
36. fgets(buffer, sizeof(buffer), source);
37. sscanf(buffer, "id=%d ## name=%s ## score=%f \n", &temp1.id, temp1.name, &temp1.score);
38. fgets(buffer, sizeof(buffer), source);
39. sscanf(buffer, "id=%d ## name=%s ## score=%f", &temp2.id, temp2.name, &temp2.score);
40. fclose(source);
41. // 显示读取的数据
42. printf("\n读取的学生数据：\n");
43. printf("ID: %d, Name: %s, Score: %.2f\n", temp1.id, temp1.name, temp1.score);
44. printf("ID: %d, Name: %s, Score: %.2f\n", temp2.id, temp2.name, temp2.score);
45. return 0;
46. }

struct student {
	int id;
	char name[20];
	float score;
}stu1,stu2;

int main(int argc, char* argv[]) {
	// 从键盘输入两个学生数据，写入一个文件中，再读出这两个学生的数据显示在屏幕上。
	FILE* source;
	printf("请输入第一个学生数据：\n");
	scanf("%d %s %f", &stu1.id, stu1.name, &stu1.score);
	printf("请输入第二个学生数据：\n");
	scanf("%d %s %f", &stu2.id, stu2.name, &stu2.score);
	// 打开源文件
	source = fopen("example.txt", "w");
	if (source == NULL) {
		printf("无法打开源文件: %s\n", argv[1]);
		return 1;
	}
	// 写入文件
	fprintf(source, "id=%d ## name=%s ## score=%f \n", stu1.id, stu1.name, stu1.score);
	fprintf(source, "id=%d ## name=%s ## score=%f \n", stu2.id, stu2.name, stu2.score);

	// 关闭文件
	fclose(source);

	// 重新打开文件进行读取
	source = fopen("example.txt", "r");
	if (source == NULL) {
		printf("无法读取文件 example.txt\n");
		return 1;
	}
	// 读取数据
	char buffer[50];
	struct student temp1, temp2;
	fgets(buffer, sizeof(buffer), source);
	sscanf(buffer, "id=%d ## name=%s ## score=%f \n", &temp1.id, temp1.name, &temp1.score);
	fgets(buffer, sizeof(buffer), source);
	sscanf(buffer, "id=%d ## name=%s ## score=%f", &temp2.id, temp2.name, &temp2.score);
	fclose(source);
	// 显示读取的数据
	printf("\n读取的学生数据：\n");
	printf("ID: %d, Name: %s, Score: %.2f\n", temp1.id, temp1.name, temp1.score);
	printf("ID: %d, Name: %s, Score: %.2f\n", temp2.id, temp2.name, temp2.score);
	return 0;
}

FILE *fp;
    fp=fopen("test.txt","w+");
    char buff[70];
    int x,y;
    scanf("%d%d",&x,&y);
    fprintf(fp,"第一个学生的数据为：%d\n",x);
    fprintf(fp,"第二个学生的数据为：%d\n",y);
    fgets(buff,70,(FILE*)fp);
    printf("%s",buff);

#include #include #include typedef struct { char name[20]; int score; }stu; int main(){ FILE *fp; char c; stu student[2]; stu r_student[2]; fp=fopen("1.txt","r+"); strcpy(student[0].name,"张三"); strcpy(student[1].name,"李四"); student[0].score=100; student[1].score=10; fwrite(&student[0],sizeof(student[0]),1,fp); fwrite(&student[1],sizeof(student[1]),1,fp); fseek(fp,0,0); fread(r_student,sizeof(r_student),1,fp); fclose(fp); printf("name = %s, grade = %d\n", r_student[0].name, r_student[0].score); printf("name = %s, grade = %d\n", r_student[1].name, r_student[1].score); return 0; }

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct {
    char name[20];
    int score;
}stu;
int main(){
    FILE *fp;
    char c;
    stu student[2];
    stu r_student[2];
    fp=fopen("1.txt","r+");
    strcpy(student[0].name,"张三");
    strcpy(student[1].name,"李四");
    student[0].score=100;
    student[1].score=10;
    fwrite(&student[0],sizeof(student[0]),1,fp);
    fwrite(&student[1],sizeof(student[1]),1,fp);
    fseek(fp,0,0);
    fread(r_student,sizeof(r_student),1,fp);
    fclose(fp);
    printf("name = %s, grade = %d\n", r_student[0].name, r_student[0].score);
    printf("name = %s, grade = %d\n", r_student[1].name, r_student[1].score);
    return 0;
}
 

#define _CRT_SECURE_NO_WARNINGS 1 
#include <stdio.h>
#include<stdlib.h>
#include<string.h>
struct stu {
    char name[20];
    float score;
}student;
int main(void)
{

    FILE* fp =fopen("D:\\OneDrive\\桌面\\test.txt", "w");
    char ch[15];
    if (fp == NULL) {
        puts("打开文件失败");
        exit(1); // 非0值表示异常退出  
    }
    for (int i = 0; i < 2; i++) {
        printf("请输入第%d个学生的数据\n", i + 1);
        scanf("%s%f", student.name, &student.score);
        fwrite(&student, sizeof(struct stu), 1, fp);
    }
    fclose(fp);

    fp = fopen("D:\\OneDrive\\桌面\\test.txt", "r");
    while (fread(&student, sizeof(struct stu), 1, fp))
    {
        printf("name=%s score=%.2f\n", student.name, student.score);
    }
    printf("\nEND!!!\n");
    fclose(fp);

    return 0;
}
 

#include #include typedef struct student{ int num; int score; }Stu; Stu stu1={1001,100},stu2={1002,99}; int main(){ FILE *fp; if((fp=fopen("abc.docx","w+"))==NULL){ printf("error"); exit(0); } fwrite(&stu1,sizeof(Stu),1,fp); fwrite(&stu2,sizeof(Stu),1,fp); rewind(fp); Stu stu_new1,stu_new2; fread(&stu_new1,sizeof(Stu),1,fp); fread(&stu_new2,sizeof(Stu),1,fp); printf("%d\t%d",stu_new1.num,stu_new2); fclose(fp); }

#include <stdio.h>
#include <string.h>

typedef struct
{
    char name[20];
    int grade;
}Stu;

int main()
{
    Stu student[2];
    strcpy(student[0].name, "张三");
    strcpy(student[1].name, "李四");
    student[0].grade = 10;
    student[1].grade = 99;
    // 写入
    FILE* fp = fopen("write_test.txt", "w+");
    if (fp == NULL)
    {
        printf("打开文件失败");
        getchar();
        return 1;
    }
    fwrite(&student[0], sizeof(student[0]), 1, fp);
    fwrite(&student[1], sizeof(student[1]), 1, fp);
    fclose(fp);

    // 读文件
    fp = fopen("write_test.txt", "r+");
    if (fp == NULL)
    {
        printf("打开文件失败");
        getchar();
        return 1;
    }
    Stu r_student[2];
    fread(r_student, sizeof(r_student) * 2, 1, fp);
    fclose(fp);

    printf("name = %s, grade = %d\n", r_student[0].name, r_student[0].grade);
    printf("name = %s, grade = %d\n", r_student[1].name, r_student[1].grade);

    return 0;
}

#include <stdio.h>

struct student{
    char name[100];
    float score;
}person;

int main()
{
    FILE *fp;

    fp = fopen("1600.dat", "wb");

    for(int i=0; i<2; i++)
    {
        scanf("%s %f", person.name, &person.score);
        fwrite(&person, sizeof(struct student), 1, fp);
    }

    fclose(fp);

    fp = fopen("1600.dat", "rb");
    while(fread(&person, sizeof(struct student), 1, fp))
    {
        printf("name=%s score=%f\n", person.name, person.score);
    }

    return 0;
}

#include <stdio.h>

struct Student

{

    char name[20];

    int age;

};

int main()

{

    struct Student stu[2];

    for (int i = 0; i < 2; i++)

    {

        printf("input student%d's name:", i + 1);

        gets(stu[i].name);

        printf("input student%d's age:", i + 1);

        scanf("%d", &stu[i].age);

        getchar();

    }

    FILE *fp;

    if ((fp = fopen("student", "w")) == NULL)

    {

        printf("打开文件失败\n");

        return 0;

    }

    fwrite(stu, sizeof(struct Student), 2, fp);

    fclose(fp);

    if ((fp = fopen("student", "r")) == NULL)

    {

        printf("打开文件失败\n");

        return 0;

    }

    struct Student stu2[2];

    fread(stu2, sizeof(struct Student), 2, fp);

    for (int i = 0; i < 2; i++)

    {

        printf("student%d's name:%s\n", i + 1, stu2[i].name);

        printf("student%d's age:%d\n", i + 1, stu2[i].age);

    }

    fclose(fp);

    return 0;

}

#include<stdio.h>
#include<stdlib.h>
struct stu
{
    int num;
    char name[20];
    double score;
}a[2], b[2];
int main()
{
    FILE *fp = fopen("d:/string.txt", "wb");
    if(fp == NULL)
    {
        printf("文件打开错误，程序退出");
        exit(-1);
    }
    for(int i = 0; i < 2; i++)
    {
        printf("请输入第%d个学生的学号姓名和成绩：\n", i+1);
        scanf("%d%s%lf", &a[i].num, a[i].name, &a[i].score);
    }
    fwrite(a, sizeof(stu), 2, fp);
    fclose(fp);
    fp = fopen("d:/string.txt", "rb");
    if(fp == NULL)
    {
        printf("文件读入错误，程序退出");
        exit(-1);
    }
    fread(b, sizeof(stu), 2, fp);
    for(int i = 0; i < 2; ++i)
    {
        printf("学号：%d，姓名：%s，成绩：%.2lf\n", a[i].num, a[i].name, a[i].score);
    }
    fclose(fp);
    fp = NULL;
    return 0;
}

#include<stdio.h>
struct Student{
    char name[20];
    int age;
    float score;
};
int main(){
    struct Student stu1, stu2;
    FILE *fp;
    printf("请输入第一个学生的姓名、年龄和成绩:");
    scanf("%s %d %f", stu1.name, &stu1.age, &stu1.score);
    printf("请输入第二个学生的姓名、年龄和成绩:");
    scanf("%s %d %f", stu2.name, &stu2.age, &stu2.score);
    fp = fopen("student.txt", "w");
    if(fp == NULL){
        printf("Failed to open the file:student.txt\n");
        return 1;
    }
    fprintf(fp, "%s %d %f\n",stu1.name, stu1.age, stu1.score);
    fprintf(fp, "%s %d %f\n",stu2.name, stu2.age, stu2.score);
    fclose(fp);
    fp = fopen("student.txt", "r");
    if(fp == NULL){
        printf("Failed to open the file:student.txt\n");
        return 1;
    }
    fscanf(fp, "%s %d %f\n", stu1.name, &stu1.age, &stu1.score);
    fscanf(fp, "%s %d %f\n", stu2.name, &stu2.age, &stu2.score);
    printf("第一个学生的信息为：%s %d %f\n",stu1.name, stu1.age, stu1.score);
    printf("第二个学生的信息为：%s %d %f\n",stu2.name, stu2.age, stu2.score);
    return 0;
}

#include <stdio.h>

typedef struct {
    char name[20];
    int age;
    float score;
} Student;

void inputStudentData(Student *student) {
    printf("请输入学生的姓名：");
    scanf("%s", student->name);
    printf("请输入学生的年龄：");
    scanf("%d", &(student->age));
    printf("请输入学生的成绩：");
    scanf("%f", &(student->score));
}

void writeStudentDataToFile(const Student *student, FILE *file) {
    fwrite(student, sizeof(Student), 1, file);
}

void readStudentDataFromFile(FILE *file) {
    printf("从文件中读取的学生数据如下：\n");
    Student student;
    while (fread(&student, sizeof(Student), 1, file) > 0) {
        printf("姓名：%s\t年龄：%d\t成绩：%.2f\n", student.name, student.age, student.score);
    }
}

int main() {
    FILE *file = fopen("students.dat", "wb");
    if (file == NULL) {
        printf("无法打开文件。\n");
        return 1;
    }

    int numStudents;
    printf("请输入学生的数量：");
    scanf("%d", &numStudents);

    for (int i = 0; i < numStudents; i++) {
        Student student;
        printf("请输入第%d个学生的数据：\n", i + 1);
        inputStudentData(&student);
        writeStudentDataToFile(&student, file);
    }

    fclose(file);

    file = fopen("students.dat", "rb");
    if (file == NULL) {
        printf("无法打开文件。\n");
        return 1;
    }

    readStudentDataFromFile(file);

    fclose(file);

    return 0;
}

#include<stdio.h>
struct Student{
    char name[20];
    int age;
    float score;
};
int main(){
    struct Student stu1, stu2;
    FILE *fp;
    
    printf("请输入第一个学生的姓名、年龄和成绩:");
    scanf("%s %d %f", stu1.name, &stu1.age, &stu1.score);
    printf("请输入第二个学生的姓名、年龄和成绩:");
    scanf("%s %d %f", stu2.name, &stu2.age, &stu2.score);
    
    fp = fopen("student.txt", "w");
    if(fp == NULL){
        printf("Failed to open the file:student.txt\n");
        return 1;
    }
    fprintf(fp, "%s %d %f\n",stu1.name, stu1.age, stu1.score);
    fprintf(fp, "%s %d %f\n",stu2.name, stu2.age, stu2.score);
    fclose(fp);
    
    fp = fopen("student.txt", "r");
    if(fp == NULL){
        printf("Failed to open the file:student.txt\n");
        return 1;
    }
    fscanf(fp, "%s %d %f\n", stu1.name, &stu1.age, &stu1.score);
    fscanf(fp, "%s %d %f\n", stu2.name, &stu2.age, &stu2.score);
    
    printf("第一个学生的信息为：%s %d %f\n",stu1.name, stu1.age, stu1.score);
    printf("第二个学生的信息为：%s %d %f\n",stu2.name, stu2.age, stu2.score);
    return 0;
}