समस्या
5 छात्रों का विवरण फाइल में स्टोर करने और fread() और fwrite() का उपयोग करके प्रिंट करने के लिए C प्रोग्राम लिखें।
समाधान
fread() फंक्शन एक बार में पूरा रिकॉर्ड पढ़ता है।
सिंटैक्स
fread(& structure variable, size of (structure variable), no of records, file pointer);
उदाहरण
struct emp{
int eno;
char ename[30];
float sal;
} e;
FILE *fp;
fread(&e, sizeof(e), 1, fp);
fwrite() फंक्शन एक बार में पूरा रिकॉर्ड लिखता है।
सिंटैक्स
fwrite(& structure variable, size of structure variable, no of records, file pointer);
उदाहरण
struct emp{
int eno;
char ename[30];
float sal;
} e;
FILE *fp;
fwrite(&e, sizeof(e), 1, fp);
प्रोग्राम
#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();
}
आउटपुट
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
