Array of structure

Q: Define a structure of student with the following fields: rollNo, name and marks. Write a program to read and store the data of at most 30 students in an array. Also display the average marks of
the students.

Solution : 

#include<stdio.h>

#define MAX 3

typedef struct Stu

{

     int roll;

     char name[20];

     int mark;

}student;

void main()

{

     student ch[MAX];

     int i,sum=0;

     for(i=0;i<MAX;i++)

     {

          printf("Enter Roll>> ");

          scanf("%d",&ch[i].roll);

          printf("Enter Name>> ");

          fflush(stdin);

          gets(ch[i].name);

          printf("Enter Marks>> ");

          scanf("%d",&ch[i].mark);

     }

     for(i=0;i<MAX;i++)

     {

          printf("\nRecord %d\nRoll\t%d",i+1,ch[i].roll);

          printf("\nName\t%s",ch[i].name);

          printf("\nMarks\t%d\n\n",ch[i].mark);

     }

     for(i=0;i<MAX;i++)

          sum+=ch[i].mark;

     printf("\nAverage Marks\t%d",sum/MAX);

}

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