#include <stdio.h>

int main() {
    FILE *fp = fopen("char.txt", "w");
    fputc('A', fp);
    fputc('B', fp);
    fclose(fp);

    fp = fopen("char.txt", "r");
    int ch;
    while((ch = fgetc(fp)) != EOF) {
        putchar(ch);
    }
    fclose(fp);
    return 0;
}

#include <stdio.h>

int main() {
    FILE *fp = fopen("message.txt", "w");
    fputs("Welcome to C File Handling\n", fp);
    fputs("Learning is easy with practice\n", fp);
    fclose(fp);

    char line[100];
    fp = fopen("message.txt", "r");
    while(fgets(line, sizeof(line), fp) != NULL)
        printf("%s", line);
    fclose(fp);
    return 0;
}

#include <stdio.h>

int main() {
    FILE *fp = fopen("marks.txt", "w");
    fprintf(fp, "%d %s %d\n", 101, "Aman", 88);
    fprintf(fp, "%d %s %d\n", 102, "Riya", 92);
    fclose(fp);

    int roll, marks;
    char name[30];
    fp = fopen("marks.txt", "r");
    while(fscanf(fp, "%d %s %d", &roll, name, &marks) == 3) {
        printf("%d %s %d\n", roll, name, marks);
    }
    fclose(fp);
    return 0;
}

#include <stdio.h>

typedef struct {
    int roll;
    char name[30];
    float marks;
} Student;

int main() {
    Student s1 = {101, "Aman", 88.5}, s2;
    FILE *fp = fopen("student.dat", "wb");
    fwrite(&s1, sizeof(Student), 1, fp);
    fclose(fp);

    fp = fopen("student.dat", "rb");
    fread(&s2, sizeof(Student), 1, fp);
    fclose(fp);

    printf("%d %s %.1f", s2.roll, s2.name, s2.marks);
    return 0;
}