grade.c

//program to print grade from a file
//grade A if marks>=80
// B if marks>=60 and <80
// C if marks<60

#include <stdio.h>
#include <stdlib.h>

int main(void)
{
    struct record
    {
        char name[20];
        int roll;
        int marks;
    } student;
    FILE *fp;
    int choice = 1;
    fp = fopen("stu", "rb");
    if (fp == NULL)
    {
        printf("Error in openning file\n");
        exit(1);
    }
    printf("\nName\t\tMarks\t\tGrade\n\n");
    while (fread(&student, sizeof(student), 1, fp) == 1)
    {
        printf("%s\t\t", student.name);
        printf("%4d\t\t", student.marks);
        if (student.marks >= 80)
            printf("A\n");
        else if (student.marks >= 60)
            printf("B\n");
        else
            printf("C\n");
    }
    fclose(fp);
    return 0;
}