How to read a binary files and print 3's on screen?

Question

Hello, I want to read a binary file of integer type and print the occurrence of the number of 3's in the file. I somehow wrote a program to open and read a binary file. Here is the couple of problems I am facing:
1. If I try to print the file on my terminal, the execution continues forever and the loop never ends.

2. I have no idea of how to filter out 3's from it.

Here is my code:

#include <iostream>
#include <fstream>
using namespace std;

int main () {
streampos size;
char * memblock;

ifstream file ("threesData.bin", ios::in|ios::binary|ios::ate);
if (file.is_open())
{
size = file.tellg();
memblock = new char [size];
file.seekg (0, ios::beg);
file.read (memblock, size);
file.close();

cout << "the entire file content is in memory";

for (int i = 0; i < size; i += sizeof(int))
{
cout << *(int*)&memblock[i] << endl;
}

delete[] memblock;
}
else cout << "Unable to open file";
return 0;
}

Answer 1

#include <iostream>
#include <fstream>
using namespace std;

int main () {

char Char;
int count=0;

ifstream file ("threesData.bin", ios::in|ios::binary|ios::ate);
if(file.is_open())
{
file.tellg(0,ios::beg);
while(!file.eof())
{
file>>Char;
if(Char==3)
count++;
}
cout<<count;
}
file.close();
return 0;
}

Answer 2

file>>char; //reads a character from the stream file
is similar to
cin>>char; //reads a character from console(user)

since file is similar to cin & cout
while(!file.eof())
{file>>char;
cout<<char;}

Answer 3

Well I know that there might be errors
I never get a program right in my first try.
But I am unaware of the way code blocks works and the way it refers to errors.
But I will try to look up something if possible.

Answer 4

Thanks a lot.
Could you describe me the line file>>char. what actually is this code doing?
Also, what if I were to print the complete file and not count 3?

Answer 5

Your code is not compiling and the error is in tellg() member function. It says something like
||=== Build file: "no target" in "no project" (compiler: unknown) ===|
C:\Users\safal\Desktop\CIS\CIS 6\Count3s.cpp\main.cpp||In function 'int main()':|
C:\Users\safal\Desktop\CIS\CIS 6\Count3s.cpp\main.cpp|13|error: no matching function for call to 'std::basic_ifstream<char>::tellg(int, const seekdir&)'|
C:\Users\safal\Desktop\CIS\CIS 6\Count3s.cpp\main.cpp|13|note: candidate is:|
C:\Program Files (x86)\CodeBlocks\MinGW\lib\gcc\mingw32\4.9.2\include\c++\istream|571|note: std::basic_istream<_CharT, _Traits>::pos_type std::basic_istream<_CharT, _Traits>::tellg() [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::pos_type = std::fpos<int>]|
C:\Program Files (x86)\CodeBlocks\MinGW\lib\gcc\mingw32\4.9.2\include\c++\istream|571|note: candidate expects 0 arguments, 2 provided|
||=== Build failed: 1 error(s), 0 warning(s) (0 minute(s), 0 second(s)) ===|