#include<stdio.h> void main() { fopen() file *fp; fp=fopen(“student.DAT”, “r”); if(fp==NULL) { printf(“The file could not be open”); exit(0); } 1....

#include <stdio.h> int main() { char name[50]; int marks, i,n; printf(“Enter number of students”); scanf(“%d”, &n); FILE *fptr; fptr=(fopen(“C:\student.txt”,”a”)); if...

Rules for Valid Identifiers in C: The identifier must begin with a letter or an underscore (_). It cannot start...