সমস্যা
৫ জন ছাত্রের ডিটেইলস ফাইলে স্টোর করে fread() ও fwrite() ব্যবহার করে প্রিন্ট করার C প্রোগ্রাম লিখুন।
সমাধান
fread() ফাংশন পুরো রেকর্ড একবারে পড়ে।
সিনট্যাক্স
fread(&structure variable, size of(structure variable), no of records, file pointer);
উদাহরণ
struct emp {
int eno;
char ename[30];
float sal;
} e;
FILE *fp;
fread(&e, sizeof(e), 1, fp);
fwrite() ফাংশন পুরো রেকর্ড একবারে লেখে।
সিনট্যাক্স
fwrite(&structure variable, size of structure variable, no of records, file pointer);
উদাহরণ
struct emp {
int eno;
char ename[30];
float sal;
} e;
FILE *fp;
fwrite(&e, sizeof(e), 1, fp);
প্রোগ্রাম
#include<stdio.h>
struct student {
int sno;
char sname[30];
float marks;
char temp;
};
main() {
struct student s[60];
int i;
FILE *fp;
fp = fopen("student1.txt", "w");
for (i = 0; i < 2; i++) {
printf("enter details of student %d\n", i + 1);
printf("student number:");
scanf("%d", &s[i].sno);
scanf("%c", &s[i].temp);
printf("student name:");
gets(s[i].sname);
printf("student marks:");
scanf("%f", &s[i].marks);
fwrite(&s[i], sizeof(s[i]), 1, fp);
}
fclose(fp);
fp = fopen("student1.txt", "r");
for (i = 0; i < 2; i++) {
printf("details of student %d are\n", i + 1);
fread(&s[i], sizeof(s[i]), 1, fp);
printf("student number = %d\n", s[i].sno);
printf("student name = %s\n", s[i].sname);
printf("marks = %f\n", s[i].marks);
}
fclose(fp);
getch();
}
আউটপুট
enter details of student 1 student number: 1 student name: pinky student marks: 56 enter details of student 2 student number: 2 student name: rosy student marks: 87 details of student 1 are student number = 1 student name = pinky marks = 56.000000 details of student 2 are student number = 2 student name = rosy marks = 87.000000
