/* 45. CREATE A FILE OF TEN RECORDS WHERE EACH RECORD HAS THE FOLLOWING FIELD : IDNO,NAME,MARKS AND AGE. READ DATA INTO THIS FILE. FIND THE AVERAGE AGE OF THESE TEN STUDENTS AND ALSO THE NAME OF THE STUDENT WHO SCORED THE MAXIMUM MARKS. */ #include#include#define MAX 10 struct student{ char name[20],idno[11]; int age; int marks; }; void main() { struct student stu; FILE *fp; int i,maxmarks; char maxname[20]; float avg=0; clrscr(); printf("Enter the records for each student :"); fp=fopen("c:\\student.txt","w"); for(i=0;i { printf("\nEnter...