Answer 1

/* Program to open, read and display content of any arbitrary file entered by user */
#include <stdio.h>
#include <stdlib.h>
int main()
{
FILE *fptr;
char filename[100], c;
printf("Enter the filename to open \n");
scanf("%s", filename);
fopen(filename, "r");
if (fptr == NULL)
{
printf("Cannot open file \n");
exit(0);
}
c = fgetc(fptr);
while (c != EOF)
{
printf ("%c", c);
c = fgetc(fptr);
}
fclose(fptr);
return 0;
}