Explore topic-wise MCQs in C++ Programming.

#include <iostream>
 int main ()
 {
 FILE * ptr;
 long size;
 ptr = fopen ("Example.txt", "rb");
 if (ptr == NULL) 
 perror ("Error opening file");
 else
 {
 fseek (ptr, 0, SEEK_END); 
 size = ftell (ptr);
 fclose (ptr);
 printf (" %ld n", size);
 }
 return 0;
 }

#include <iostream>
 #include <fstream>
 using namespace std;
 int main ()
 {
 char ch;
 streambuf * pbuf;
 ofstream os ("Example.txt");
 pbuf = os.rdbuf();
 do {
 ch = cin.get();
 pbuf -> sputc(ch);
 } while (ch != '.');
 os.close();
 return 0;
 }

#include <iostream>
 using namespace std;
 int main ()
 {
 char First_ch, Second_ch, Third_ch;
 cout << "Enter any word or number: ";
 First_ch = cin.get();
 cin.sync();
 Second_ch = cin.get();
 cin.sync();
 Third_ch = cin.get();
 cout << First_ch << endl;
 cout << Second_ch << endl;
 cout << Third_ch << endl;
 return 0;
 }

#include <iostream>
 #include <fstream>
 using namespace std;
 int main () 
 {
 int len;
 char * buff;
 ifstream is;
 is.open ("Example.txt", ios :: binary );
 is.seekg (0, ios :: end);
 len = is.tellg();
 is.seekg (0, ios :: beg);
 buff = new char [len];
 is.read (buff, len);
 is.close();
 cout.write (buff, len);
 delete[] buff;
 return 0;
 }

#include <iostream>
 using namespace std;
 int main ()
 {
 int num1 = 150;
 double num2 = 6.251;
 cout << num1;
 cout << " ";
 cout << num2 << " " << num1 * num2;
 endl (cout);
 return 0;
 }

#include <iostream>
 #include <fstream>
 using namespace std;
 int main () 
 {
 ofstream outfile ("Sample.txt");
 for (int num = 0; num < 50; num++)
 {
 outfile << num;
 outfile.flush();
 }
 cout << "Done successfully";
 outfile.close();
 return 0;
 }

#include <iostream>
 int main ()
 {
 char buff[BUFSIZ];
 FILE *ptr1, *ptr2;
 ptr1 = fopen ("FirstFile.txt", "w");
 ptr2 = fopen ("SecondFile.txt", "a");
 setbuf ( ptr1 , buff );
 fputs ("Buffered stream", ptr1);
 fflush (ptr1);
 setbuf ( ptr2 , NULL );
 fputs ("Unbuffered stream", ptr2);
 fclose (ptr1);
 fclose (ptr2);
 return 0;
 }

#include 
 int main ()
 {
 FILE * ptr;
 char buff[] = { 'I' , 'L' , 'U' };
 ptr = fopen ( "Example.txt" , "wb" );
 fwrite (buff , 1 , sizeof(buff) , ptr );
 fclose (ptr);
 return 0;
 }

#include <iostream>
 int main ()
 {
 int k;
 FILE * ptr;
 char buff[10];
 ptr = fopen ("Sample.txt", "w+");
 for ( k = 'A' ; k <= 'D' ; k++)
 fputc ( k, ptr);
 rewind (ptr);
 fread (buff, 1, 5, ptr);
 fclose (ptr);
 buff[3] = ' 0';
 puts (buff);
 return 0;
 }

#include <iostream>
 int main ()
 {
 freopen ("Sample.txt", "w", stdout);
 printf ("This is redirected to a file");
 fclose (stdout);
 return 0;
 }