Lab1

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

void write()
{
    char roll_number[10];
    char roll_number2[10];
    char name[100];
    int age;
    char blood_group[5];
    char dept_name[20];
    int faculty;
    char hometown[100];
    char mobile_number[20];
    float cgpa;
    char semester[10];
    FILE *student_file;
    //FILE *course_file;
    FILE *grade_file;

    while(1)
    {


        student_file = fopen("student.txt","a");
        if(student_file == NULL)
        {
            printf("Error opening file\n");
            break;
        }
        printf("Enter your student ID:\t");
        scanf("%s",roll_number);
        if(strcmp(roll_number,"-1") == 0)
        {
            fclose(student_file);
            break;

        }

        fprintf(student_file,"%s\t\t",roll_number);
        printf("Enter your name:\t");
        scanf("%s",name);
        fprintf(student_file,"%s\t",name);
        printf("Enter your age:\t");
        scanf("%d",&age);
        fprintf(student_file,"%d\t\t",age);
        printf("Enter your blood group:\t");
        scanf("%s",blood_group);
        fprintf(student_file,"%s\t",blood_group);
        printf("Enter your department name:\t");
        scanf("%s",dept_name);
        fprintf(student_file,"%s\t\t",dept_name);
        printf("Enter no. of faculties:\t");
        scanf("%d",&faculty);
        fprintf(student_file,"%d\t\t",faculty);
        printf("Enter your hometown:\t");
        scanf("%s",hometown);
        fprintf(student_file,"%s\t\t",hometown);
        printf("Enter your mobile number:\t");
        scanf("%s",mobile_number);
        fprintf(student_file,"%s\n",mobile_number);
        //fprintf(student_file,"-----------------------------\n");
        fclose(student_file);

        grade_file = fopen("grade.txt","a");
        if(grade_file == NULL)
        {
            printf("Error opening file\n");
            break;
        }

        printf("Enter your student ID:\t");
        scanf("%s",roll_number2);
        if(strcmp(roll_number2,"-1") == 0 || strcmp(roll_number2,roll_number)!=0)
        {
           fclose(grade_file);
           break;

        }

        fprintf(grade_file,"%s\t\t",roll_number2);
        printf("Enter your CGPA:\t");
        scanf("%f",&cgpa);
        fprintf(grade_file,"%.2f\t",cgpa);
        printf("Enter your semester:\t");
        scanf("%s",semester);
        fprintf(grade_file,"%s\n",semester);
        //fprintf(grade_file,"-----------------------------\n");
        fclose(grade_file);







    }
}













int main()
{

    FILE *student_file;
    FILE *grade_file;
    student_file = fopen("student.txt","a");
        if(student_file == NULL)
        {
            printf("Error opening file\n");
            exit(1);
        }
        fprintf(student_file,"student_id\t");
        fprintf(student_file,"name\t");
        fprintf(student_file,"age\t ");
        fprintf(student_file,"blood_group\t");
        fprintf(student_file,"department_name\t");
        fprintf(student_file,"no_of_faculties\t");
        fprintf(student_file,"hometown\t");
        fprintf(student_file,"mobile_number\t\n");
        fclose(student_file);


        grade_file = fopen("grade.txt","a");
        if(grade_file == NULL)
        {
            printf("Error opening file\n");
            exit(1);
        }

        fprintf(grade_file,"student_id\t");
        fprintf(grade_file,"GPA\t");
        fprintf(grade_file,"Semester\t\n");
        fclose(grade_file);



    while(1)
    {
         printf("What do you want to do?\n");
         printf("1.Add an entry.\n");
         printf("2.Read entries.\n");
         int choice;
         scanf("%d",&choice);
         if(choice==-1)
         {
             break;
         }
         if(choice==1)
         {
             write();
         }


    }

    return 0;
}