Question

C Programming: Create a struct named “Student” along with 3 properties, Name, ID, Score Choosing the correct data type for each property. Once the program is running, it will check if the student.bin file is exist and if it is not exist, the program will ask user to enter three student information and save them to file student.bin . If the file is exist, read the second student information and print it in console.

Answer 1

#include<stdio.h>
struct student {
   int id;
   int score;
   char name[20];
}s1,s2,s3; // struct student is created
int main() {
   FILE *fptr;
   int i = 1;
   struct student out;
   fptr = fopen("student.bin","r"); //opening the file in read mode
   if(fptr == NULL) {
       fptr = fopen("student.bin","w"); // if the file doesnot exists opening the file in write mode
       printf("Enter student1 information in order name id score\n");
       scanf("%s %d%d",s1.name,&s1.id,&s1.score);
       printf("Enter student2 information in order name id score\n");
       scanf("%s %d%d",s2.name,&s2.id,&s2.score);
       printf("Enter student3 information in order name id score\n");
       scanf("%s %d%d",s3.name,&s3.id,&s3.score); //writing the student information in a file
       fwrite(&s1,sizeof(struct student),1,fptr);
       fwrite(&s2,sizeof(struct student),1,fptr);
       fwrite(&s3,sizeof(struct student),1,fptr);
       fclose(fptr);
   } else {
       printf("File Exists\nThe 2nd student information\n");
       while(fread(&out,sizeof(struct student),1,fptr)) {
           if(i == 2) {
               printf("Name = %s ID = %d Score = %d",out.name,out.id,out.score); // if then file exists printing the second student inforrmation
           }
           i++;
       }
   }
return 0;  
}