# include <stdio.h> # include <conio.h> # include <string.h> struct student{ long roll ; char name[20]; char branch[20]; }; int add() { struct student s; system("cls"); FILE *fp; char c; fp=fopen("record.txt","a"); while (1) { printf("ENTER THE Roll Number:->"); scanf("%ld",&s.roll); fflush(stdin); printf("\nENTER THE NAME :->"); scanf("%s",s.name); fflush(stdin); printf("\nENTER THE BRANCH :-...